When to plant grass seed: the best time in every state

Best time to plant grass seed in your state

Grass seeding dates for all 50 states

Cool-season lawns: seed in late summer

Kentucky bluegrass, tall fescue, fine fescue and perennial ryegrass are cool-season grasses. In 35 states the main window we list is for these grasses, and nearly every one of them puts it in late summer or early fall. Cornell gives the reasons: soil is still warm, weed pressure is lower than in spring and rain is more likely. UNH adds that weed seeds don’t sprout as readily then while grass seed does well in cool fall weather.

• Mid-August to mid-September: Iowa, Maine, Minnesota, Montana, New York, Oregon, Rhode Island and northern Indiana.
• Later in the Midwest and mid-South: Missouri runs Aug. 25 to Oct. 10, southern Indiana and southern Illinois seed in September, and Tennessee seeds tall fescue Aug. 20 to Sept. 15.
• Exceptions: Alaska seeds early June to mid-July, and Washington puts April and May first. Wyoming goes by weather: nights above 40°F and days below 85°F.

Warm-season lawns: seed in late spring and early summer

Bermudagrass, centipedegrass, zoysiagrass and buffalograss need warm soil. Texas A&M says warm-season seed germinates best at 70 to 95°F and puts the best seeding time in late spring to early summer. Clemson targets May 1–14 across South Carolina, Oklahoma marks late April through June for bermuda, and Arkansas says not to seed bermuda or zoysia after July 1.

In the low desert of Arizona and southern Nevada, the fall date Extension gives is for overseeding bermuda lawns with ryegrass in October for winter color.

States with both kinds of lawns

In Alabama, Arkansas, California, Georgia, Mississippi, New Mexico, South Carolina, Texas and West Virginia, the Extension pages we read give separate windows for cool-season and warm-season grass. The pattern holds in each: cool-season grass (mostly tall fescue) in late summer or fall, warm-season grass from spring into summer. Mississippi’s table shows how much it shifts within one state: bermuda can go in from April 15 on the Gulf Coast but starts May 15 in the north.

Is it too late to plant grass seed?

New grass needs time to root before winter. UNH says it should be at least six to eight weeks old before the first hard frost, and South Dakota says to seed at least two weeks before your first frost date. Some states give a hard cutoff:

• Connecticut: before Oct. 4.
• Missouri: Oct. 10.
• Maryland: no later than mid-October.
• Western Washington: as late as Oct. 15.
• Michigan: early October only if the weather cooperates.
• North Dakota: Sept. 15.

Check your average first frost on our frost dates by state page and count back.

Can you seed in spring?

Yes, but most northern states call it second best. Illinois lists April as the second-best time, New Jersey says early spring is next best but weeds make it harder, Kentucky says spring seeding needs irrigation and extra care, and California’s next-best window for cool-season grass is March to April. Penn State says mid-to-late spring also works in Pennsylvania. Washington is the exception and lists April and May first on both sides of the state.

Questions

Related guides

• Grass seed in Pennsylvania: which seed, how much and when
• Soil testing by state
• Frost dates in all 50 states
• Planting calendar by state
• Hardiness zone by ZIP code
• All state guides

Sources: each state’s row links the Extension page or publication we read on Nov. 14, 2026. Seeding windows are general guides; weather in a given year can move them a week or two either way.

Muthler Landscaping & Construction LLC · 913 Bellefonte Ave, Lock Haven, PA 17745 · (570) 397-9800 · PA HIC #PA212584. Seeding windows are as published by each state’s Extension service on the date checked; we are not affiliated with any university.