Nashua, NH Lawn Care Calendar
In a typical year, put down crabgrass preventer in Nashua between Apr 25 and May 21. The best time to overseed is between Aug 4 and Sep 23. The last spring frost usually comes around Apr 29. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Nashua
| Task | Typical window |
|---|---|
| Crabgrass preventer (pre-emergent)Crabgrass sprouts once soil stays above 55°F. Apply when soil reaches 50°F, before that happens. | Apr 25 – May 21 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | May 14 – Jun 18 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Aug 4 – Sep 23 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Aug 24 – Nov 4 |
Median dates, 2016–2025, from NOAA weather data for Nashua. This year's dates can differ by a few weeks.
Month-by-month lawn care in Nashua
- JanuaryNo treatments due; mow as needed.
- FebruaryNo treatments due; mow as needed.
- MarchNo treatments due; mow as needed.
- AprilCrabgrass preventer (pre-emergent)
- MayCrabgrass preventer (pre-emergent)Spring fertilizer
- JuneSpring fertilizer
- JulyNo treatments due; mow as needed.
- AugustOverseeding & seedingFall fertilizer
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberFall fertilizer
- DecemberNo treatments due; mow as needed.
Soil temperature in Nashua by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 28°F and peaks in July at 74°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 25.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 28°F | 29°F | 37°F | 47°F | 58°F | 67°F | 74°F | 72°F | 65°F | 54°F | 41°F | 31°F |
Nashua lawn timing, year by year
Over the last 10 years, soil in Nashua reached 50°F, the signal for crabgrass preventer, as early as Apr 11 (2017) and as late as May 12 (2022): 31 days apart. A fixed calendar date can't follow that, which is why the report above uses this year's soil temperature. Between the typical last spring frost (Apr 29) and first fall frost (Oct 18), the growing season lasts about 172 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 20 | Apr 18 | Oct 10 |
| 2024 | Apr 29 | Apr 27 | Oct 17 |
| 2023 | Apr 12 | May 18 | Oct 31 |
| 2022 | May 12 | May 9 | Oct 20 |
| 2021 | Apr 28 | Apr 22 | Oct 24 |
| 2020 | May 3 | May 14 | Oct 9 |
| 2019 | Apr 20 | Apr 29 | Oct 5 |
| 2018 | Apr 26 | Apr 23 | Oct 18 |
| 2017 | Apr 11 | May 9 | Oct 17 |
| 2016 | Apr 22 | Apr 28 | Oct 11 |
Estimated from daily temperatures for Nashua. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Nashua?
In a typical year, between Apr 25 and May 21. Put it down when soil reaches 50°F, before it stays above 55°F and crabgrass starts sprouting. Early springs move this up by a week or more, so check this year's soil temperature above.
When is the best time to plant grass seed in Nashua?
Early fall, typically Aug 4 – Sep 23, while soil cools from 65°F toward 50°F.
When is the last frost in Nashua?
The median last spring frost is Apr 29 and the median first fall frost is Oct 18 (2016–2025).
How long is the growing season in Nashua?
About 172 days, from the median last spring frost on Apr 29 to the median first fall frost on Oct 18 (2016–2025).
Lawn care guides
More New Hampshire lawn calendars
Nearby cities in other states
- Lowell, MA 12 miles away · crabgrass preventer Apr 20 – May 21
- Boston, MA 35 miles away · crabgrass preventer Apr 14 – May 19
- Worcester, MA 39 miles away · crabgrass preventer Apr 25 – May 13
- Brattleboro, VT 56 miles away · crabgrass preventer Apr 23 – May 22