For cool-season grass (tall fescue, Kentucky bluegrass, fine fescue), the best time is late summer to early fall: August 15 to September 15 in Indiana (Purdue), mid-August to mid-October in Maryland, and as late as September 15 to October 15 on the North Carolina coast. For warm-season grass (bermuda, zoysia, centipede), it’s late spring and early summer: mid-May into June in Maryland, March or April to July in North Carolina.
First, which grass are you sowing?
- Cool-season grasses, such as tall fescue, Kentucky bluegrass, fine fescue and perennial ryegrass, grow most in spring and fall and are the lawns of the North and the middle of the country. Sow them as summer ends.
- Warm-season grasses, such as bermudagrass, zoysiagrass and centipedegrass, grow in summer heat and go brown in winter. They’re the lawns of the South. Sow them once spring has warmed up.
Not every lawn grass comes as seed. St. Augustinegrass seed isn’t available, so it is planted as sod or plugs (NC State), and the University of Maryland calls starting zoysia from seed challenging.
When to sow, by region
Each row comes from the turf program for that region. Solid bars are cool-season grasses; striped bars, warm-season.
Cool-season grass: August 15 to September 15 · Purdue Turf
Tall fescue and Kentucky bluegrass: August 15 to September 1 · NC State Extension
Cool-season grass: mid-August to mid-October. Warm-season grass: mid-May into June · University of Maryland Extension
Tall fescue: September 1 to October 1. Bermudagrass and zoysiagrass: April to July; centipedegrass: March to July · NC State Extension
Tall fescue: September 15 to October 15. Zoysiagrass and centipedegrass: March to July; bermudagrass: April to July · NC State Extension
Zones for each region are from the 2023 USDA map. NC State says seeding outside these dates increases the chance of failure.
Why late summer beats spring for cool-season grass
- Two cool seasons to grow. Seed sown in late summer gets fall and then spring to establish before its first summer (Penn State).
- Fewer weeds. Weed competition is greatest on spring seedings and is the most common reason they fail (University of Maryland).
- No summer stress on babies. Spring seedlings face summer heat and drought before their roots are deep (Penn State). NC State doesn’t recommend late-winter or spring seeding of tall fescue; if fall was missed, its fallback for the piedmont is mid-February to early March.
- Every week counts. Purdue finds that seeding one week later can mean the lawn takes two more weeks to mature.
The limit is cold. Seed won’t germinate once the soil gets too cold in late fall (Penn State), and the University of Maryland notes that fall-sown seed that hasn’t sprouted dies over the winter, except Kentucky bluegrass.
After you sow
- Cover lightly. Grass seed needs light to germinate. Keep it under no more than about ½ inch of soil, or rake in ¼ to ½ inch of topsoil or compost (University of Maryland); Penn State drags the seed in to cover it with about ¼ inch of soil.
- Water lightly and often. About ¼ inch per watering, enough to keep the top inch moist but not soggy, and not in the evening (University of Maryland).
- Expect about two weeks for the seed to germinate and 4 to 6 weeks before the first mowing (University of Maryland). Tall fescue gets there faster than Kentucky bluegrass.
| Grass | Seed per 1,000 sq ft |
|---|---|
| Tall fescue | 6–8 lb |
| Fine fescue | 4–6 lb |
| Kentucky bluegrass | 2–3 lb |
| Bermudagrass | 1 lb |
| Zoysiagrass | 1 lb |
Seeding rates for a new lawn, from the University of Maryland Extension. Our grass seed calculator, which turns these into pounds for your yard, is coming soon.
Questions people ask
What month is best to put grass seed down?
For cool-season lawns, September in most places: mid-August to mid-September in the North, September to mid-October farther south. For warm-season lawns, May or June.
Is October too late to plant grass seed?
For cool-season grass it depends on where you are: mid-October is the end of the window in Maryland and on the North Carolina coast, but in Indiana the best window closes in mid-September. The colder the soil, the less likely the seed sprouts before winter.
Can you plant grass seed in the spring?
Warm-season grass, yes: that is its season. Cool-season grass can be sown in spring (March into early April in Maryland), but it’s harder: more weeds, and summer heat arrives before the roots are deep.
Can you just throw grass seed on the ground?
It needs contact with soil and a light cover: no more than about ½ inch of soil over it (University of Maryland), and steady moisture until it sprouts.
How long does grass seed take to grow?
About two weeks to germinate and 4 to 6 weeks to the first mowing in good conditions (University of Maryland).
Sources
- Purdue University Turfgrass Science, Start Seeding Cool-Season Turf Now (Aaron Patton, 2014): August 15 to September 15 as the optimum window; a week’s delay can cost two weeks of growth.
- NC State Extension, Carolina Lawns (AG-69, 2021), Table 2: planting dates by region and grass; seeding beyond them increases the chance of failure; spring seeding of tall fescue not recommended; St. Augustinegrass seed unavailable.
- University of Maryland Extension, Starting a New Lawn (updated 2026): cool-season mid-August to mid-October; warm-season mid-May into June; spring seeding and weeds; germination at 50–70 °F soil; seeding rates; ½ in of cover at most; watering; about 2 weeks to germinate, mowing at 4–6 weeks.
- Penn State Extension, Lawn Establishment (updated 2025): late summer gives two cool growing seasons; spring seedings face more weeds and summer heat and drought; no germination in cold late-fall soil; seed dragged in under about ¼ in of soil.
- Zones: USDA Plant Hardiness Zone Map (2023), and the ZIP-code listing from the PRISM Group, Oregon State University, prism.oregonstate.edu, accessed October 11, 2026.