New Hampshire Lawn Care Calendar
In New Hampshire, crabgrass preventer typically goes down between Apr 25 and May 31: first in Manchester, last in Berlin. Below are typical fertilizer, seeding and frost dates for Manchester, Concord, Berlin and Nashua, from 2016–2025 weather data. Enter your ZIP code for this year's timing.
When to apply pre-emergent in New Hampshire
Typically between Apr 25 and May 31, depending on where you live. The window opens first in Manchester (around Apr 25) and last in Berlin (around May 17). Apply when soil reaches 50°F, before it stays above 55°F.
| City | Crabgrass preventer window |
|---|---|
| Manchester | Apr 25 – May 21 |
| Concord | Apr 25 – May 23 |
| Nashua | Apr 25 – May 21 |
| Berlin | May 17 – May 31 |
Cool-season lawn calendar
Lawns across New Hampshire are mostly cool-season grass (tall fescue, Kentucky bluegrass, perennial ryegrass).
| City | Spring fertilizer | Overseeding & seeding | Fall fertilizer |
|---|---|---|---|
| Manchester | May 14 – Jun 18 | Aug 5 – Sep 24 | Aug 21 – Nov 4 |
| Concord | May 16 – Jun 20 | Jul 30 – Sep 18 | Aug 19 – Nov 4 |
| Berlin | May 24 – Jun 28 | Jul 16 – Sep 4 | Jul 15 – Oct 26 |
| Nashua | May 14 – Jun 18 | Aug 4 – Sep 23 | Aug 24 – Nov 4 |
Frost dates in New Hampshire
| City | Last spring frost | First fall frost |
|---|---|---|
| Manchester | Apr 26 | Oct 19 |
| Concord | May 4 | Oct 13 |
| Berlin | May 16 | Sep 29 |
| Nashua | Apr 29 | Oct 18 |
Median dates, 2016–2025. A dash means frost does not occur in most years.
Frequently asked questions
When should I put down pre-emergent in New Hampshire?
Typically between Apr 25 and May 31, depending on where you live. The window opens first in Manchester (around Apr 25) and last in Berlin (around May 17). Apply when soil reaches 50°F, before it stays above 55°F.
When is the best time to seed grass in New Hampshire?
Early fall is best for cool-season grass (tall fescue, Kentucky bluegrass, perennial ryegrass): typically from Jul 16 to Sep 24 across New Hampshire, while soil cools from 65°F toward 50°F.
What type of grass grows in New Hampshire?
Most lawns in New Hampshire are cool-season grass (tall fescue, Kentucky bluegrass, perennial ryegrass).
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