LawnWeather

Berlin, NH Lawn Care Calendar

In a typical year, put down crabgrass preventer in Berlin between May 17 and May 31. The best time to overseed is between Jul 16 and Sep 4. The last spring frost usually comes around May 16. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).

Typical lawn care dates in Berlin

Crabgrass preventer (pre-emergent)
May 17 – May 31
Spring fertilizer
May 24 – Jun 28
Overseeding & seeding
Jul 16 – Sep 4
Fall fertilizer
Jul 15 – Oct 26
Light band: typical frost-free season. Bars: typical windows.
TaskTypical window
Crabgrass preventer (pre-emergent)Crabgrass sprouts once soil stays above 55°F. Apply when soil reaches 50°F, before that happens.May 17 – May 31
Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing.May 24 – Jun 28
Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost.Jul 16 – Sep 4
Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F.Jul 15 – Oct 26

Median dates, 2016–2025, from NOAA weather data for Berlin. This year's dates can differ by a few weeks.

Month-by-month lawn care in Berlin

  1. JanuaryNo treatments due; mow as needed.
  2. FebruaryNo treatments due; mow as needed.
  3. MarchNo treatments due; mow as needed.
  4. AprilNo treatments due; mow as needed.
  5. MayCrabgrass preventer (pre-emergent)Spring fertilizer
  6. JuneSpring fertilizer
  7. JulyOverseeding & seedingFall fertilizer
  8. AugustOverseeding & seedingFall fertilizer
  9. SeptemberOverseeding & seedingFall fertilizer
  10. OctoberFall fertilizer
  11. NovemberNo treatments due; mow as needed.
  12. DecemberNo treatments due; mow as needed.

Soil temperature in Berlin by month

Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 18°F and peaks in July at 66°F. Crabgrass preventer goes down when it reaches 50°F, usually around May 17.

JanFebMarAprMayJunJulAugSepOctNovDec
18°F19°F27°F38°F51°F60°F66°F64°F58°F48°F34°F23°F

Berlin lawn timing, year by year

Over the last 10 years, soil in Berlin reached 50°F, the signal for crabgrass preventer, as early as May 2 (2025) and as late as May 21 (2023): 19 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 (May 16) and first fall frost (Sep 29), the growing season lasts about 136 days.

YearCrabgrass window openedLast spring frostFirst fall frost
2025May 2May 1Sep 21
2024May 15Apr 27Oct 17
2023May 21May 26Oct 24
2022May 12May 19Sep 30
2021May 16May 7Oct 25
2020May 21Jun 2Sep 19
2019May 20May 10Sep 19
2018May 3May 13Sep 23
2017May 18May 21Oct 1
2016May 21May 17Sep 26

Estimated from daily temperatures for Berlin. A dash means it didn't happen that year.

Frequently asked questions

When should I apply pre-emergent in Berlin?

In a typical year, between May 17 and May 31. 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 Berlin?

Early fall, typically Jul 16 – Sep 4, while soil cools from 65°F toward 50°F.

When is the last frost in Berlin?

The median last spring frost is May 16 and the median first fall frost is Sep 29 (2016–2025).

How long is the growing season in Berlin?

About 136 days, from the median last spring frost on May 16 to the median first fall frost on Sep 29 (2016–2025).

Lawn care guides

Growing vegetables too? See the Berlin planting calendarfor when to start seeds and plant outside.

More New Hampshire lawn calendars

Nearby cities in other states