How to Plant Grass Seed: 12 Steps From Bare Soil to First Mowing

Key takeaways

• Seed cool-season grass from mid-August to mid-October in Maryland, and warm-season grass from mid-May into June; the soil temperature target for germination is 50 to 70°F at a 1-inch depth (University of Maryland Extension).
• Till 4 to 6 inches deep and, where a soil test shows organic matter under 3 percent, mix in 1 to 2 inches of compost: 3 to 6 cubic yards per 1,000 sq ft (UMD; Purdue AY-3).
• Grade the soil away from the house at 1 to 2 percent, a 1 1/4 to 2 1/2 inch drop every 10 feet (UMD); Purdue warns that slopes steeper than a 1-foot drop every 4 feet bring mowing and erosion problems (Purdue AY-28).
• Sow tall fescue at 6 to 8 lb and Kentucky bluegrass at 2 to 3 lb per 1,000 sq ft, half the seed in each of two directions at right angles (Penn State Extension).
• Cover seed with no more than about 1/2 inch of soil or 1/4 inch of compost or straw, because grass seed needs light to germinate (UMD); a leaf rake dragged lightly leaves most seed about 1/4 inch deep (Penn State).
• Water 2 to 4 times a day so the top 0.5 to 1 inch never dries, and keep broadleaf herbicides off until the seedlings have been mowed at least 3 times (Purdue AY-3).

When is the best time to plant grass seed?

Plant cool-season grass (tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescues) in late summer to early fall, and warm-season grass (bermudagrass, zoysiagrass, centipedegrass) in late spring to early summer. University of Maryland Extension puts the windows at mid-August to mid-October and mid-May into June, with germination fastest at 50 to 70°F soil temperature, measured about 1 inch deep (UMD, Starting a New Lawn).

Early in the window beats late. Purdue says that even inside its Aug. 15 to Sept. 15 window for northern Indiana and Illinois, waiting one week to seed may mean the stand takes 2 to 4 more weeks to mature (Purdue AY-3). Spring is the fallback: UMD calls March to early April seeding harder than fall, and says weed competition is the most common cause of failed spring seedings.

Grass and region	Seeding window	What to check	Source
Cool-season, Maryland	Mid-Aug. to mid-Oct.; spring March to early April (harder)	Germination takes about 2 weeks; killing frosts possible in November	UMD Extension
Cool-season, northern Indiana and Illinois	Aug. 15 to Sept. 15	One week late can add 2 to 4 weeks to maturity	Purdue AY-3
Cool-season, southern Indiana and Illinois	Sept. 1 to Sept. 30	Same	Purdue AY-3
Cool-season, dormant seeding (Indiana, Illinois)	Thanksgiving to March	Seed waits for April or May soil warmth; works best in the northern half	Purdue AY-3
Kentucky bluegrass or tall fescue, North Carolina mountains	Aug. 15 to Sept. 1	Seeding after the date raises failure risk	NC State Table 9-4
Bermudagrass, North Carolina Piedmont	April to July	Warm-season seed germinates at 68 to 95°F air temperature (UT W160-B)	NC State Table 9-4
Centipedegrass, North Carolina Piedmont	March to July	Seeded centipedegrass may take 2 to 3 years to establish	NC State
Zoysiagrass (Zenith, Compadre), Arkansas	May 15 to July 1	Seeding before May 15 can cut germination in cool soil	Arkansas MP476
Warm-season, Maryland	Mid-May into June	Less than 10 hours of daylight (Nov. to Feb.) supports no grass growth	UMD Extension

The two leading sources disagree on winter seeding. Purdue recommends dormant seeding from Thanksgiving to March because freeze and thaw cracks give seed a place to lodge (Purdue AY-3), while UMD says ungerminated fall-sown seed dies over winter, except Kentucky bluegrass. Dormant seeding is a cold-climate tactic; where winters swing warm, as in southern Indiana, Purdue itself warns that seed can sprout and then freeze. Our month-by-month lawn care schedule places seeding next to fertilizer and crabgrass preventer dates.

Should you seed, lay sod or patch?

Seed when you are inside the seeding window, can water 2 to 4 times a day for several weeks and can wait 4 to 6 weeks for the first mowing (UMD). Choose sod when you need a usable lawn in about a month, are outside the window, or are planting a grass sold only as sod, plugs or sprigs. Very steep ground and deep shade may need no lawn at all.

Sod roots in 2 to 3 weeks and can go down any time the ground is not frozen and daytime highs stay below 90°F, according to UMD. Seed costs far less: about $5 to $46 of seed covers 1,000 sq ft of most lawn grasses against $283 to $523 for the same area of sod at the farm, as compiled in our sod vs seed comparison.

If your situation is	Do this	Why (source)
Slope steeper than a 1-foot drop every 4 feet (25%)	Terrace, build a wall or plant a ground cover instead of lawn	Purdue AY-28: mowing and erosion problems
Slope you can mow but that washes	Seed under an erosion blanket, hydroseed, or sod pegged on the high side	Penn State; UT W160-B; Purdue AY-28
Fewer than 6 hours of direct sun	Use a shade mix (fine fescues at 4 to 5 lb per 1,000 sq ft) or switch to a ground cover	UMD; Penn State Table 1
Water puddles for 24 hours or more	Fix drainage before seeding, or plant a rain garden	UMD
Soil test shows under 3% organic matter	Till in 1 to 2 in of compost (3 to 6 cu yd per 1,000 sq ft)	UMD
Lawn needed within about a month	Lay sod: roots in 2 to 3 weeks vs 4 to 6 weeks to a mowable seeded lawn	UMD
Past the seeding window, cool-season grass	Sod now, or dormant seed after the ground cools (northern states)	UMD; Purdue AY-3
You want zoysiagrass	Plugs or sod; seed only Zenith or Compadre, May 15 to July 1, no deeper than 1/4 in	UMD; Arkansas MP476
You want St. Augustinegrass	Sod or sprigs; NC State lists no seeding rate for it	NC State Table 9-4
Bare spot under 4 inches across in bermudagrass, zoysiagrass or Kentucky bluegrass	Let it fill in; seed larger spots	NC State
Bare spot in tall fescue or perennial ryegrass, any size	Seed it: bunch-type grasses cannot spread	NC State
You cannot water 2 to 4 times a day	Postpone seeding during drought, mulch with straw, or lay sod	UMD; Purdue AY-3

1. 1Is the slope steeper than a 1-foot drop every 4 feet?

   YesSkip the lawn: terrace, build a wall or plant a ground cover (Purdue AY-28).

   NoGo to the next question

2. 2Does the area get fewer than 6 hours of direct sun?

   YesSeed a fine fescue shade mix at 4 to 5 lb per 1,000 sq ft, or plant a ground cover (UMD; Penn State).

   NoGo to the next question

3. 3Does water stand for 24 hours or more after rain?

   YesFix the drainage first, or plant a rain garden (UMD).

   NoGo to the next question

4. 4Do you want zoysiagrass or St. Augustinegrass?

   YesUse plugs, sprigs or sod; zoysia seed only as Zenith or Compadre, May 15 to July 1 (UMD; Arkansas MP476; NC State).

   NoGo to the next question

5. 5Do you need a usable lawn within about a month, or are you outside the seeding window?

   YesLay sod: it roots in 2 to 3 weeks and goes down whenever the ground is not frozen and highs stay under 90°F (UMD).

   NoGo to the next question

6. 6Will you be unable to water 2 to 4 times a day for several weeks?

   YesPostpone seeding, dormant seed in the North, or lay sod (UMD; Purdue AY-3).

   NoSeed it: till 4 to 6 inches, sow half the seed each way, rake it about 1/4 inch under, roll, straw lightly and water 2 to 4 times a day.

Source: UMD Extension; Purdue AY-3 and AY-28; Penn State Extension; Arkansas MP476; NC State Extension

Thickening a lawn that still has at least half its grass is overseeding, not new-lawn planting, and uses about half the seed per 1,000 sq ft; the aeration and seeding steps for that job are in our guide to overseeding a lawn.

How do you plant grass seed, step by step?

Planting grass seed on bare soil takes 12 steps: test, kill weeds, grade, add soil, till, settle, fertilize, sow, rake, roll, mulch and water. Most of the calendar goes to the soil test, a weed kill that can take up to 3 weeks and letting tilled soil settle. Every step below carries the number an extension service attaches to it (Purdue AY-3; Penn State).

1. Test the soil 3 to 4 weeks ahead. Take 10 to 15 cores 3 to 4 inches deep and mix them into one sample (NC State). UMD says lime is needed only below pH 5.5, with 6.0 to 6.8 optimum and 5.8 to 6.5 suiting tall fescue. Our soil test guide covers labs and fees.
2. Kill existing grass and weeds. Spray glyphosate, which has no soil residual but does not kill weed seeds (Penn State). Wait for full kill, a few days to 3 weeks, and at least 7 days before tilling so it reaches the roots (NC State). The label sets the seeding wait; the table below lists the intervals on seven current labels.
3. Clear and rough grade. Rake out stones larger than 2 inches (Penn State) and slope the ground away from the house at 1 to 2 percent (UMD) for at least 15 feet (Purdue AY-28). Do not change grade over tree roots.

4. Add topsoil only where it is thin. Penn State wants 4 to 6 inches of settled topsoil, with about 2 inches of it mixed into the top 2 to 3 inches of subsoil so water does not perch at the boundary. One cubic yard covers 81 sq ft at 4 inches; delivered prices are on our topsoil cost page.
5. Amend and till 4 to 6 inches deep. Spread compost 1 to 2 inches deep when organic matter tests under 3 percent (UMD), plus any lime the report calls for, then till moist (not wet) soil in 1 or 2 passes (Penn State). Over-tilling to powder causes crusting.
6. Let it settle, then fine grade. Water or rain settles the soil; a light roller works when it is dry. Walk it: there should be no visible footprints (NC State), and Purdue’s sod guide says footprints deeper than 0.5 inch need more watering or rolling (AY-28). Rake until clods are marble size or smaller.

Steps 1 to 6 are the ones most often skipped, and UMD lists their failures by name: compacted soil that will not absorb water, incomplete blending of compost that leaves uneven drainage, and mounds that the mower scalps later (UMD, causes of new lawn failure). A seed bed that passes the footprint test usually fixes all three.

7. Spread starter fertilizer. Apply what the soil test calls for; Purdue uses 1.5 lb of phosphate (P₂O₅) per 1,000 sq ft on low-phosphorus soil (AY-3 Table 1), and Penn State caps nitrogen below 1.5 lb per 1,000 sq ft to avoid burn. Check the state rules in the phosphorus table below.
8. Sow half the seed in each of two directions. Set the spreader low, walk north to south with half, then east to west with the rest (UMD). Purdue prefers a drop spreader because rotary spreaders spread seed less evenly (AY-3).
9. Rake the seed in lightly. Drag a leaf rake in straight lines without pressure; most seed ends up about 1/4 inch deep and some stays visible (Penn State). Never bury it under more than about 1/2 inch of soil (UMD).
10. Roll once. Use an empty water-fill lawn roller for seed-to-soil contact (Purdue AY-3), with the roller and soil surface dry so seed does not stick to the drum (Penn State).
11. Mulch with straw, not hay. Spread 80 to 100 lb of clean straw per 1,000 sq ft on level ground (Penn State), thin enough that about half the soil shows (Purdue). On seeded zoysiagrass, skip heavy straw: it cut coverage in Arkansas trials (MP476).
12. Water the same day, then 2 to 4 times daily. Apply about 1/4 inch per session for seed (UMD), keep the top 0.5 to 1 inch moist (Purdue) and avoid evening watering. Our grass seed germination guide gives sprouting days and the taper schedule.

How long should you wait after weed killer before planting grass seed?

The product label sets the wait, and it ranges from 3 days to a year. A glyphosate lawn product can allow seeding 3 days after spraying, broadleaf killers 1 to 4 weeks, and crabgrass preventers 3 to 12 months. Read the “reseeding” or “replant” line on your exact label before you buy seed; the label is the law (EPA-accepted Roundup label).

Product (EPA Reg. No.)	Active ingredient	Wait before seeding, per the label	Label
Roundup Weed & Grass Killer Concentrate Plus (71995-29)	Glyphosate 18% + diquat	Lawn grasses may be planted 3 days after application	EPA label, April 2022
Razor (228-366)	Glyphosate 41%	Delay tillage or renovation 7 days; no fixed seeding day count	EPA label, January 2015
Speed Zone Broadleaf (2217-833)	2,4-D, mecoprop-p, dicamba, carfentrazone	Reseed 1 week after application	EPA label, March 2025
Trimec Classic Broadleaf (2217-543)	2,4-D, MCPP-p, dicamba	Grass seed can be sown 3 to 4 weeks after application	EPA label, April 2014
Tenacity (100-1267)	Mesotrione	May be applied before or after seeding, except fine fescue; blends under 20% fine fescue	EPA label, September 2022
Dimension 2EW (62719-542)	Dithiopyr	Seeding within 3 months of one application (4 months after sequential ones over 2 pt/acre) may fail	EPA label, July 2021
Barricade 4FL (100-1139)	Prodiamine	4 to 12 months, by rate and region (4 months at 16 fl oz/acre)	EPA label, February 2024

If a crabgrass preventer went down this spring, a fall seeding may still fail: at Barricade 4FL’s 24 fl oz rate the northern wait is 6 months. The broadleaf rule from the extension side is similar to the labels: Missouri puts 2,4-D and dicamba at a 3 to 4 week reseeding restriction and spot-sprayed glyphosate at 3 to 5 days (University of Missouri IPM).

Pesticide use is regulated by the label. This page is general information, not a pesticide recommendation; read and follow the current label for the product you use and your state’s rules.

How much seed, fertilizer, compost and straw do you need?

Per 1,000 sq ft of new lawn, plan on 6 to 8 lb of tall fescue seed (or 2 to 3 lb of Kentucky bluegrass), about 6 lb of an 18-24-12 starter fertilizer, 3 to 6 cubic yards of compost if the soil needs it, and 80 to 100 lb of straw. Multiply by your lawn area in thousands of square feet (Penn State; UMD).

Material	Amount per 1,000 sq ft	Notes	Source
Tall fescue seed	6 to 8 lb	Purdue lists 6 to 9 lb, but its own per-acre figure (261 to 348 lb) works out to 6 to 8	Penn State Table 1
Kentucky bluegrass seed	2 to 3 lb	Purdue and UT use 1.5 to 2 lb	UMD
Perennial ryegrass seed	4 to 5 lb	UT: 4 to 6 lb	Penn State Table 1
Fine fescue seed (shade)	4 to 5 lb	UMD: 4 to 6 lb	Penn State Table 1
Bermudagrass seed, hulled	1 to 2 lb	Double for unhulled seed (UT)	NC State Table 9-4
Centipedegrass seed	0.25 to 0.5 lb	Slow: 2 to 3 years to full cover	NC State Table 9-4
Starter fertilizer, 18-24-12	6.25 lb	Delivers 1.5 lb phosphate (P2O5), Purdue’s low-P rate	Purdue AY-3 Table 1 (our arithmetic)
Compost, 1 in deep	3.09 cu yd	Only if organic matter is under 3%	UMD (1,000 sq ft x 1 in / 324)
Compost, 2 in deep	6.17 cu yd	Deeper layers are hard to till evenly	Penn State
Straw	80 to 100 lb (2 to 3 bales of 30 to 40 lb)	Purdue calls 1 bale a light cover; NC State 1 to 2 bales for cool-season grass	Penn State
Lime, no soil test	75 lb ground limestone	NC State’s default when no test was done; skip for centipedegrass	NC State
Water per session	About 1/4 in (156 gallons)	1 inch over 1,000 sq ft is 623 gallons	UMD (our arithmetic)

Seed amounts double for coated or unhulled seed, and our grass seed cost guide prices each species per pound and per bag. More seed is not better: UT warns that seeding too heavily gives “a very dense stand of weak, poorly developed and disease-prone seedlings” (UT W160-B).

Starter fertilizer: how much nitrogen does each product deliver?

Divide the target nutrient by the percentage on the bag. To put down Purdue’s 1.5 lb of phosphate per 1,000 sq ft with an 18-24-12 product, spread 1.5 / 0.24 = 6.25 lb, which also delivers 6.25 x 0.18 = 1.13 lb of nitrogen. That sits above Penn State’s 0.5 to 1 lb starter range but under the 1.5 lb burn line (Penn State).

Product and rate per 1,000 sq ft	Nitrogen (lb)	Phosphate, P2O5 (lb)	How it is used	Source
18-24-12 at 6.25 lb	1.13	1.50	Surface, at seeding	Purdue AY-3 rate; our arithmetic
16-22-8 at 6.8 lb	1.09	1.50	Surface, at seeding (Purdue’s example analysis)	Purdue AY-3
10-10-10 at 10 lb	1.00	1.00	Surface, at seeding (top of Penn State’s range)	Penn State
20-10-10 at 5 lb	1.00	0.50	Surface, at seeding	Penn State
5-10-10 at 40 lb	2.00	4.00	Tilled 6 to 8 in deep before planting, no soil test	NC State
10-20-20 at 20 lb	2.00	4.00	Tilled 6 to 8 in deep before planting, no soil test	NC State
18-4-6 at 16 lb	2.88	0.64	Tilled 6 to 8 in deep before planting, no soil test	NC State

The table shows why the soil test comes first: NC State’s no-test examples put down 2 to 2.9 lb of nitrogen, worked deep into the soil, while a surface starter at seeding should stay near 1 lb. If your report shows high phosphorus (25 ppm or more in Purdue’s Table 1), Purdue still allows 1.0 lb of phosphate for new seed; in several states below, the law decides.

Lawn area, in thousands of sq ft: 5 = 5,000 sq ft (x 1,000 sq ft)Seed at the new-lawn rate (cost per 1,000 sq ft)Tall fescue, 6 to 8 lb ($12 to $46 per 1,000 sq ft)Kentucky bluegrass, 2 to 3 lb ($7 to $18)Perennial ryegrass, 4 to 5 lb ($10 to $25)Fine fescue shade mix, 4 to 5 lb ($13 to $30)Bermudagrass, hulled raw, 1 to 2 lb ($10 to $22)

Add-ons

Starter fertilizer 18-24-12 at 6.25 lb, per 1,000 sq ft ($10 to $10 each) Straw, 2 to 3 bales per 1,000 sq ft ($15 to $40 each) Compost or blend, 1 in deep, per 1,000 sq ft (if organic matter is under 3%) ($115 to $165 each) Soil test, 1 sample ($10 to $20) Rear-tine tiller rental, 1 day ($60 to $100) Water-fill roller rental, 1 day ($25 to $40) Walk-behind spreader rental, 1 day ($10 to $25)

Starter fertilizer, 18-24-12 (lb)

31

Straw bales (90 lb per 1,000 sq ft, 35 lb bales)

13

Compost for 1 in (cu yd)

15.4

Water per 1/4 in session (gallons)

779

Estimated DIY materials and rental$265 to $650

Seed = area x extension new-lawn rate x Oct. 18, 2026 seller prices (our grass seed cost page). Starter fertilizer: LESCO 18-24-12, $60.99 to $82.99 per 50 lb bag. Straw: $7.00 to $13.99 a bale. Compost: 3.09 cu yd per 1,000 sq ft at $38 to $53 a yard, before delivery. Rentals: posted day rates, Oct. 28, 2026. Pre-tax.

How much slope does a new lawn need?

A new lawn should fall away from the house at roughly 1 to 4 percent, depending on the extension service: UMD recommends 1 to 2 percent, NC State 2 to 3 percent and Penn State 1 to 4 percent. At 2 percent the ground drops about 2 1/2 inches every 10 feet; Purdue sets the upper limit for a mowable lawn at a 1-foot drop every 4 feet (Purdue AY-28).

Right against the foundation, building codes ask for more: IRC R401.3 requires the grade to fall at least 6 inches within the first 10 feet, about 5 percent, and our lawn leveling guide shows how to check it with a string line.

1. Univ. of Maryland1
2. Purdue AY-282
3. NC State2
4. Penn State1

Source: UMD Extension; Purdue AY-28-W; NC State Extension Gardener Handbook ch. 9; Penn State Extension, Lawn Establishment Purdue gives a single figure, a 1-foot drop in 50 feet (2%). Each 1% equals about 1.2 inches of drop per 10 feet.

Show the numbers

	Low end	High end
Univ. of Maryland	1	2
Purdue AY-28	2	2
NC State	2	3
Penn State	1	4

Source	Recommended grade away from buildings	Drop per 10 ft	Other rule	Link
University of Maryland Extension	1% to 2%	1 1/4 to 2 1/2 in	Never slope toward a building; do not regrade over tree roots	Starting a New Lawn
Purdue AY-28	About 2% (1 ft in 50 ft)	2.4 in	Slope away at least 15 ft; steeper than 1 ft in 4 ft causes mowing and erosion problems	AY-28-W
NC State Extension	2% to 3%	2.4 to 3.6 in	Firm the soil until no footprints show	Gardener Handbook ch. 9
Penn State Extension	1% to 4% (1 to 4 ft per 100 ft)	1.2 to 4.8 in	Shape the subsoil first, lowered for 4 to 6 in of topsoil	Lawn Establishment

To check grade without a laser level, run a string between a stake at the foundation and one 10 feet out, level it with a line level, and measure down to the soil at the far stake. A 1 1/4 to 2 1/2 inch gap meets UMD’s range. Penn State recommends setting the grade on the subsoil before topsoil goes back, marked on stakes at fixed intervals (Penn State).

How deep should grass seed be planted?

Grass seed should sit at or just under the surface: most of it about 1/4 inch deep and none under more than about 1/2 inch of soil. A light drag with a leaf rake leaves most seed about 1/4 inch deep (Penn State); UMD caps cover at about 1/2 inch of soil or 1/4 inch of compost or straw, because grass seed needs light to germinate (UMD).

1. Penn State: raked soil0.25
2. UMD: soil0.50
3. UMD: compost or straw0.25
4. UT: organic topdressing0.25
5. Arkansas: zoysiagrass seed0.25

Source: Penn State Extension; UMD Extension; UT W160-B; University of Arkansas MP476 Penn State's figure is the typical depth left by a light leaf-rake drag; UT's range is 1/8 to 1/4 inch.

Show the numbers

	Maximum cover
Penn State: raked soil	0.25
UMD: soil	0.50
UMD: compost or straw	0.25
UT: organic topdressing	0.25
Arkansas: zoysiagrass seed	0.25

Source	How to cover the seed	Maximum cover	Link
Penn State Extension	Drag a leaf rake in straight lines with no pressure, then roll	About 1/4 in of soil; some seed stays visible	Lawn Establishment
University of Maryland Extension	Raking in is optional; a light cover of topsoil or finished compost helps germination	About 1/2 in of soil, 1/4 in of compost or straw	Starting a New Lawn
UT Extension W160-B	Rake and roll, then topdress with organic matter as a mulch substitute	1/8 to 1/4 in of organic matter	W160-B
University of Arkansas MP476	Maximize seed-to-soil contact; zoysiagrass needs light	1/4 in for zoysiagrass seed	MP476
NC State Extension	Hand rake or drag a mat or a span of chain-link fence, then roll	Light cover (no depth given)	Gardener Handbook ch. 9

Can you just throw grass seed on bare dirt?

You can, but expect thin, patchy results on hard or crusted soil. UMD says raking seed in is not strictly necessary, yet Purdue calls seed-to-soil contact critical and pairs a light raking with rolling for that reason (Purdue AY-3). Seed lying on a hard surface dries out between waterings, washes off in heavy rain and feeds birds.

On hard dirt, loosen the soil first. For small bare spots, NC State says to loosen the top 4 to 6 inches with a rake, hoe or shovel, or the top 2 to 3 inches where hand tools cannot go deeper, and to smooth it until clods are smaller than marbles (NC State). For a whole yard, a rented rear-tine tiller ($60 to $100 a day in the rental table below) does the same job.

To keep birds off, UMD suggests a lightweight floating row cover or open-weave cheesecloth, tacked down with landscape staples and removed once grass pushes against it; a thin layer of straw also hides seed (UMD). Avoid covers with plastic mesh, which UMD notes can trap wildlife and will not break down.

Where do popular planting guides differ from extension advice?

Seed-company guides and extension publications agree on the basics (two passes, light cover, frequent watering), but they part ways on 5 points: spreader type, compost depth, the temperature trigger, how deep to keep soil moist and when to mow. Extension services also disagree with each other on straw, and two older extension guides name a herbicide that is no longer registered. In each row below, the extension figure is the land-grant recommendation.

Topic	What the guide or publication says	What the extension publication says	Source
Spreader type	Pennington: a broadcast or rotary spreader gives “more uniform coverage”	Purdue: use a drop spreader “because rotary spreaders do not disperse the seed uniformly”; UMD and NC State accept either with two passes at right angles	Purdue AY-3
Compost before seeding	Pennington: incorporate compost “at a depth of 2 to 4 inches”	UMD and Penn State: a 1 to 2 inch layer, tilled 4 to 6 in deep; layers over 2 in are hard to till evenly	Penn State
When to start	Pennington: wait for daytime temperatures of 60 to 75°F	UMD: soil at 50 to 70°F, measured about 1 in deep; UT: cyclic air temperatures of 59 to 82°F for cool-season seed	UMD
Moisture after sprouting	Scotts: keep the top 2 inches moist until the grass reaches about 3 inches	Purdue: keep the top 0.5 to 1 inch moist, then water less often and deeper once seedlings are 2 inches tall	Purdue AY-3
First mowing	Pennington and Scotts: mow once grass reaches 3 inches	Purdue: start when the first seedlings can be cut, tall fescue at 2.0 in; UMD: tall fescue at 4 in, cut to 3 in	Purdue AY-3
Preemergent at seeding	Purdue AY-3 (2006) and UT W160-B (2007): siduron (Tupersan) is the preemergent to use at seeding	EPA lists every siduron registration found as inactive (technical product since Dec. 31, 2020); the Tenacity (mesotrione) label allows use before or after seeding, except on fine fescue	Tenacity label
Straw rate	Purdue AY-3 and NC State: one bale per 1,000 sq ft (NC State: 1 to 2 for cool-season grass)	Penn State and UMD: 80 to 100 lb, which is 2 to 3 bales of 30 to 40 lb; UT’s one bale is a 50 lb bale	Penn State

None of these gaps will sink a lawn by itself. The two that cost the most are compost depth, because 4 inches of compost on a 5,000 sq ft lawn is about 62 cubic yards against 15 to 31 at 1 to 2 inches, and mowing late, which Purdue says is the common mistake: “Most wait too long to mow a newly seeded lawn” (Purdue AY-3).

Can you use a phosphorus starter fertilizer in your state?

Yes in every state below for a new lawn, and most limit the exemption to the first growing season. These states restrict phosphorus on established lawns but exempt new seeding, usually alongside a soil test that shows a deficiency. Minnesota allows it when “first establishing turf via seed or sod procedures, and only during the first growing season” (Minn. Stat. §18C.60).

State	Law	Exemption for a new seeded lawn	Other route to use phosphorus
Minnesota	Minn. Stat. §18C.60	First establishing turf by seed or sod, first growing season only	Soil test within 3 years shows a need
Wisconsin	Wis. Stat. §94.643	Establishing grass by seed or sod, during that growing season	Soil test within 36 months
New York	ECL §17-2103	Newly established lawn, first growing season	Soil test shows a need
Vermont	10 V.S.A. §1266b	First establishing grass in turf by seed or sod, first growing season	Recent soil test
Washington	RCW 15.54.500	Establishing or repairing grass with seed or sod, in the growing season it is established	Soil deficient in available phosphorus
Maryland	Agric. §8-803.5	First-time establishment; also reestablishing or repairing turf	Soil test
New Jersey	N.J.S.A. 4:9-15.8a	Establishing, reestablishing or repairing a turf area	Soil test
Virginia	Va. Code §3.2-3600	Starter products sold for new turf or turf being repaired or renovated	Soil test within 3 years
Massachusetts	330 CMR 31.05	New lawn on bare ground or a renovation, first growing season	Soil test 3 years old or less

This table is general information, not legal advice. Fertilizer laws and local ordinances change; confirm with your state agriculture or environment agency before you buy a phosphorus starter fertilizer.

What should you do in the first 8 weeks after seeding?

The 4 to 8 weeks after seeding decide whether a new lawn survives; Penn State says more establishments fail from poor follow-up care than from every other step combined (Penn State). Water lightly and often until mowing starts at 4 to 6 weeks, then feed, mow often and hold herbicides until the grass has been cut 3 to 4 times.

1. Perennial ryegrass sprouts3
2. Tall fescue sprouts6
3. Bermudagrass (hulled) sprouts10
4. Kentucky bluegrass sprouts14
5. First mowing28
6. Starter fertilizer runs out42
7. Critical care period ends28

Source: UT W160-B (germination days); UMD Extension (mowing at 4 to 6 weeks, starter fertilizer lasts 6 to 8 weeks); Penn State Extension (4 to 8 week critical period) Weeks converted to days (x 7). Germination days assume soil in the right temperature range.

Show the numbers

	Earliest day	Latest day
Perennial ryegrass sprouts	3	7
Tall fescue sprouts	6	12
Bermudagrass (hulled) sprouts	10	20
Kentucky bluegrass sprouts	14	21
First mowing	28	42
Starter fertilizer runs out	42	56
Critical care period ends	28	56

Milestone	When	What to do	Source
Tall fescue and ryegrass germinate	6 to 12 days (ryegrass 3 to 7)	Keep the top 0.5 to 1 in moist, 2 to 4 waterings a day	UT W160-B; Purdue
Kentucky bluegrass germinates	14 to 21 days	Keep watering for the slowest grass in the mix	UT W160-B; UMD
Seedlings about 2 in tall	Set by height, not by date	Water less often and deeper	Purdue AY-3
First mowing	4 to 6 weeks	Tall fescue: cut at 2 in (Purdue) or let it reach 4 in and cut to 3 in (UMD); never remove more than 1/3	UMD; Purdue
First feeding	4 to 6 weeks after germination	0.75 to 1 lb nitrogen per 1,000 sq ft; repeat at 8 to 10 weeks	Purdue AY-3
Foot traffic	At least 1 month after germination, or 2 mowings	Keep people and pets off until then	UMD
Broadleaf herbicide	After 3 mowings	Quinclorac and carfentrazone are the seedling-safe exceptions (Purdue)	Purdue AY-3; UMD
Crabgrass preventer	After 4 mowings (UMD); 4 to 8 mowings by product (Purdue)	Barricade 4FL label: wait 60 days after seeding or until after the second mowing, whichever is longer	UMD; Purdue

Mowing advice varies by grass. UT starts upright grasses (tall fescue, perennial ryegrass, chewings and hard fescue) at a 2-inch cut when they average 3 inches, and bermudagrass and zoysiagrass at 1 1/2 inches when they reach 2 1/4 inches (UT W160-B). Use a sharp blade: UMD notes that dull blades can pull young grass out of the ground. Species-by-species mowing heights and care calendars are in our turf and trees guides.

Do all-in-one seed, mulch and fertilizer products work on bare spots?

They work on small spots and cost several times more per square foot than raw seed. Scotts EZ Seed Patch & Repair Sun and Shade covers up to 225 sq ft per 10 lb bag, and Pennington One Step Complete up to 75 sq ft per 5 lb bag, against 1,000 sq ft for 6 to 8 lb of raw tall fescue (Penn State).

Product	Coverage (label)	What is in it	Claim and its condition	Source
Scotts EZ Seed Patch & Repair Sun and Shade	Up to 225 sq ft per 10 lb ($47.49); up to 890 sq ft per 40 lb ($131.99)	Seed, mulch that absorbs 6X its weight in water, 1-0-0 controlled-release fertilizer, tackifier, mefenoxam seed treatment	“Grows 2X thicker than ordinary seed”: in greenhouse testing with less than optimal watering	Scotts product page and bag label
Scotts EZ Seed Patch & Repair Tall Fescue	Up to 85 sq ft per 3.75 lb ($23.99)	Tall fescue seed, mulch, controlled-release fertilizer, tackifier, protectant	Germinates in 7 to 14 days on average	Scotts product page
Pennington One Step Complete Sun and Shade	Up to 75 sq ft per 5 lb; 1 cup per sq ft for bare areas	Smart Seed, fertilizer and wood mulch	“Repairs bare spots in 2 weeks or less under proper growing conditions”; plant no more than 1/4 in deep	Pennington product page
Pennington Smart Patch Sun and Shade	Up to 200 sq ft per 10 lb; 1 lb per 4 sq ft on bare spots	Annual ryegrass, perennial ryegrass and Kentucky bluegrass, with a tackifier	“Seedling emergence in as little as 5 days”; germination 5 to 14 days	Pennington product page

Price per 1,000 sq ft shows the gap. At Scotts’ own figures, EZ Seed Sun and Shade costs $148 per 1,000 sq ft in the 40 lb bag and $211 in the 10 lb bag; raw tall fescue seed for the same area runs $12 to $46, and our grass seed cost guide shows the per-pound math. Starter fertilizer and straw add about $22 to $52 more per 1,000 sq ft to the raw-seed route.

The products bundle what extension guides already recommend. Penn State describes pelletized newspaper mulches, some with starter fertilizer built in, that swell when wet and cover the soil (Penn State). The rule that matters is the same for both: Scotts’ label says to apply so “bare ground is still visible so that seed contacts the soil,” which matches UMD’s light-cover rule.

How much does it cost to plant grass seed yourself vs hiring a pro?

Doing it yourself on a 5,000 sq ft lawn costs about $334 to $647 for seed, starter fertilizer, straw, a soil test and one day each of tiller, roller and spreader rental, and about $980 to $1,805 if the soil also needs an inch of compost. Posted hydroseeding rates run $0.10 to $0.25 per sq ft on prepared soil, before any grading.

Rental store	Rear-tine tiller	Mid- or front-tine tiller	Water-fill roller	Sod cutter	Spreader
RC Engine Service, Waynesboro, Pa.	$80 (Toro 17 in) to $100 (Troy-Bilt 20 in)	$60	$30 (36 in, tow)	$85 (Turfco, 21 in)	$45 (tow-behind)
Arco Lawn Equipment, St. Louis area, Mo.	$80	n/a	n/a	$90	$15
M&K Rentals, Sheridan, Wyo.	$82 (Honda 20 in) to $90 (Barreto 918)	n/a	$28 to $32	$92 (Billy Goat 18 in)	n/a
Nickell Rental, Newnan, Ga.	$83 (Honda FRC800)	$49 to $60	n/a	n/a	n/a
Dutchway Hardware, Gap, Pa.	$85	$69	$39 (36 in, tow)	n/a	$8 (drop) to $25 (broadcast)
Middleton Farmers Cooperative, Middleton, Wis.	n/a	n/a	$25 (24 in, push) to $35 (48 in, tow)	n/a	n/a
American Power Equipment, Mobile area, Ala.	$60 (Honda)	n/a	n/a	$120 (18 in)	n/a

A rear-tine tiller is the machine for breaking new ground: day rates in the table run $60 to $100, while lighter mid-tine tillers rent for $49 to $69 and suit soil already loosened. A sod cutter ($85 to $120 a day) is only needed when old turf must be stripped rather than killed and tilled in.

Line item, 5,000 sq ft tall fescue lawn	Quantity	Low	High	Source of the price
Soil test	1 sample	$10	$20	University lab fees, our topsoil cost page
Rear-tine tiller	1 day	$60	$100	Rental table above
Water-fill lawn roller	1 day	$25	$39	Rental table above
Walk-behind spreader	1 day	$8	$25	Rental table above
Tall fescue seed	30 to 40 lb (one 50 lb bag)	$99.99	$169.99	Seller price lists, our grass seed cost page
Starter fertilizer, 18-24-12	31 lb (one 50 lb bag)	$60.99	$82.99	LESCO 50 lb bag at three hardware stores (Oct. 28) and our Oct. 18 listing
Straw	10 to 15 bales (80 to 100 lb per 1,000 sq ft)	$70.00	$209.85	$7.00 a bale (USDA AMS, farm) to $13.99 (Agway of Cape Cod)
Subtotal, soil already has organic matter		$333.98	$646.83	Sum
Compost or topsoil-compost blend, 1 in deep (if needed)	15.4 cu yd	$586	$818	$38 to $53 a yard, our topsoil cost page
Bulk delivery, one load	1	$60	$340	Our topsoil cost page
Total with compost		$980	$1,805	Sum

1. DIY: seed, fertilizer, straw, rentals334
2. DIY plus 1 in of compost980
3. Hydroseed, posted rates500
4. Grading plus seeding (Ohio, posted)1,500
5. Strip, till, grade, hydroseed (GIR model)4,200
6. Sod on ready soil (GIR estimate)5,000

Source: Rental and retail prices posted Oct. 28, 2026; seed prices Oct. 18, 2026; Professional Hydroseeding, Grass Master, Prime Hydroseeding and Railey's Lawn Care price pages; GIR hydroseeding and sod cost models Estimates; the line items are in the tables beside this chart. Excludes herbicide, water and tax.

Show the numbers

	Low	High
DIY: seed, fertilizer, straw, rentals	334	647
DIY plus 1 in of compost	980	1,805
Hydroseed, posted rates	500	1,400
Grading plus seeding (Ohio, posted)	1,500	6,250
Strip, till, grade, hydroseed (GIR model)	4,200	4,410
Sod on ready soil (GIR estimate)	5,000	8,000

The calculator above prices seed by the pound rather than by the whole bag, so its default for 5,000 sq ft of tall fescue, $263 to $651, differs slightly from the bag-based subtotal in this table. Straw is the swing item in both: 10 farm bales at $7.00 cost $70, while 15 retail bales at $13.99 cost $210.

Hired option	Posted price	5,000 sq ft	Source
Hydroseeding, prepared soil (Utah)	$0.20 per sq ft, $300 minimum	$1,000	Professional Hydroseeding
Hydroseeding (Seattle area, over 3,000 sq ft)	$0.10 to $0.20 per sq ft	$500 to $1,000	Grass Master
Hydroseeding (Charlotte area)	$0.10 to $0.25 per sq ft; $1,400 minimum up to 6,000 sq ft	$1,400	Prime Hydroseeding
Grading plus seeding (Marysville, Ohio)	Grading $1,000 to $5,000 per project; seeding adds $0.10 to $0.25 per sq ft	$1,500 to $6,250	Railey’s Lawn Care
Strip, till, grade and hydroseed	GIR estimate	$4,200 to $4,410	Our hydroseeding cost model
Sod installed on ready, graded soil	$1.00 to $1.60 per sq ft (GIR estimate)	$5,000 to $8,000	Our sod installation cost guide

The gap between doing it yourself and hiring is mostly soil work, not seed. Railey’s Lawn Care prices grading alone at $1,000 to $5,000, and our hydroseeding cost model shows prep taking a 5,000 sq ft job from about $820 to more than $4,200. If a pro does the grade and you do the seeding, ask the quote to state the finished slope (1 to 2 percent away from the house) and the settled topsoil depth (4 to 6 inches) in writing.

Step	Number to hit	Source
Grade	1% to 2% away from the house (1 1/4 to 2 1/2 in per 10 ft)	UMD
Till	4 to 6 in deep, moist not wet, 1 or 2 passes	Purdue AY-3; Penn State
Compost	1 to 2 in (3 to 6 cu yd per 1,000 sq ft) if organic matter is under 3%	UMD
Starter fertilizer	1.5 lb P2O5 on low-P soil; under 1.5 lb N	Purdue AY-3; Penn State
Seed	Tall fescue 6 to 8 lb, Kentucky bluegrass 2 to 3 lb per 1,000 sq ft, in 2 passes	Penn State; UMD
Cover	About 1/4 in of raked soil; never over 1/2 in	Penn State; UMD
Straw	80 to 100 lb per 1,000 sq ft, half the soil visible	Penn State; Purdue
Water	2 to 4 times a day, top 0.5 to 1 in moist	Purdue AY-3