LawnWeather

Greeley, CO Lawn Care Calendar

In a typical year, put down crabgrass preventer in Greeley between Apr 23 and May 17. The best time to overseed is between Jul 26 and Sep 14. The last spring frost usually comes around May 1. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).

Typical lawn care dates in Greeley

Crabgrass preventer (pre-emergent)
Apr 23 – May 17
Spring fertilizer
May 10 – Jun 14
Overseeding & seeding
Jul 26 – Sep 14
Fall fertilizer
Aug 29 – Oct 30
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.Apr 23 – May 17
Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing.May 10 – Jun 14
Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost.Jul 26 – Sep 14
Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F.Aug 29 – Oct 30

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

Month-by-month lawn care in Greeley

  1. JanuaryNo treatments due; mow as needed.
  2. FebruaryNo treatments due; mow as needed.
  3. MarchNo treatments due; mow as needed.
  4. AprilCrabgrass preventer (pre-emergent)
  5. MayCrabgrass preventer (pre-emergent)Spring fertilizer
  6. JuneSpring fertilizer
  7. JulyOverseeding & seeding
  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 Greeley by month

Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 25°F and peaks in July at 74°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 23.

JanFebMarAprMayJunJulAugSepOctNovDec
25°F28°F39°F46°F56°F68°F74°F72°F65°F51°F39°F30°F

Greeley lawn timing, year by year

Over the last 10 years, soil in Greeley reached 50°F, the signal for crabgrass preventer, as early as Mar 19 (2017) and as late as May 6 (2016): 48 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 1) and first fall frost (Oct 9), the growing season lasts about 161 days.

YearCrabgrass window openedLast spring frostFirst fall frost
2025Apr 12Apr 30Oct 19
2024Apr 14May 8Oct 25
2023Apr 30Apr 25Oct 7
2022Apr 28May 1Oct 13
2021Apr 5Apr 25Oct 14
2020Apr 24Apr 20Sep 9
2019Apr 21May 22Oct 7
2018Apr 29Apr 28Oct 10
2017Mar 19May 4Oct 3
2016May 6May 3Oct 5

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

Frequently asked questions

When should I apply pre-emergent in Greeley?

In a typical year, between Apr 23 and May 17. 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 Greeley?

Early fall, typically Jul 26 – Sep 14, while soil cools from 65°F toward 50°F.

When is the last frost in Greeley?

The median last spring frost is May 1 and the median first fall frost is Oct 9 (2016–2025).

How long is the growing season in Greeley?

About 161 days, from the median last spring frost on May 1 to the median first fall frost on Oct 9 (2016–2025).

Lawn care guides

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

More Colorado lawn calendars

Nearby cities in other states