Boston, MA Lawn Care Calendar
In a typical year, put down crabgrass preventer in Boston between Apr 14 and May 19. The best time to overseed is between Sep 1 and Oct 21. The last spring frost usually comes around Apr 3. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Boston
| 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 14 – May 19 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | May 12 – Jun 16 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Sep 1 – Oct 21 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Sep 6 – Nov 12 |
Median dates, 2016–2025, from NOAA weather data for Boston. This year's dates can differ by a few weeks.
Month-by-month lawn care in Boston
- 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.
- AugustNo treatments due; mow as needed.
- SeptemberOverseeding & seedingFall fertilizer
- OctoberOverseeding & seedingFall fertilizer
- NovemberFall fertilizer
- DecemberNo treatments due; mow as needed.
Soil temperature in Boston by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 33°F and peaks in July at 75°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 14.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 33°F | 34°F | 40°F | 49°F | 59°F | 69°F | 75°F | 75°F | 68°F | 58°F | 46°F | 36°F |
Boston lawn timing, year by year
Over the last 10 years, soil in Boston reached 50°F, the signal for crabgrass preventer, as early as Apr 8 (2021) and as late as May 3 (2020): 25 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 3) and first fall frost (Nov 15), the growing season lasts about 226 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 19 | Apr 10 | Nov 20 |
| 2024 | Apr 12 | Mar 25 | Nov 14 |
| 2023 | Apr 12 | Apr 3 | Nov 12 |
| 2022 | Apr 12 | Mar 30 | Nov 19 |
| 2021 | Apr 8 | Apr 3 | Nov 20 |
| 2020 | May 3 | Apr 18 | Oct 31 |
| 2019 | Apr 14 | Apr 2 | Nov 9 |
| 2018 | Apr 25 | Apr 11 | Nov 15 |
| 2017 | Apr 11 | Mar 26 | Nov 11 |
| 2016 | Apr 22 | Apr 10 | Nov 21 |
Estimated from daily temperatures for Boston. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Boston?
In a typical year, between Apr 14 and May 19. 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 Boston?
Early fall, typically Sep 1 – Oct 21, while soil cools from 65°F toward 50°F.
When is the last frost in Boston?
The median last spring frost is Apr 3 and the median first fall frost is Nov 15 (2016–2025).
How long is the growing season in Boston?
About 226 days, from the median last spring frost on Apr 3 to the median first fall frost on Nov 15 (2016–2025).
Lawn care guides
More Massachusetts lawn calendars
Nearby cities in other states
- Nashua, NH 35 miles away · crabgrass preventer Apr 25 – May 21
- Providence, RI 41 miles away · crabgrass preventer Apr 14 – May 13
- Manchester, NH 48 miles away · crabgrass preventer Apr 25 – May 21
- Warwick, RI 49 miles away · crabgrass preventer Apr 14 – May 10