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
| 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 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
- 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
- JulyOverseeding & seeding
- AugustOverseeding & seedingFall fertilizer
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberNo treatments due; mow as needed.
- 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 25°F | 28°F | 39°F | 46°F | 56°F | 68°F | 74°F | 72°F | 65°F | 51°F | 39°F | 30°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.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | Apr 12 | Apr 30 | Oct 19 |
| 2024 | Apr 14 | May 8 | Oct 25 |
| 2023 | Apr 30 | Apr 25 | Oct 7 |
| 2022 | Apr 28 | May 1 | Oct 13 |
| 2021 | Apr 5 | Apr 25 | Oct 14 |
| 2020 | Apr 24 | Apr 20 | Sep 9 |
| 2019 | Apr 21 | May 22 | Oct 7 |
| 2018 | Apr 29 | Apr 28 | Oct 10 |
| 2017 | Mar 19 | May 4 | Oct 3 |
| 2016 | May 6 | May 3 | Oct 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
More Colorado lawn calendars
Nearby cities in other states
- Cheyenne, WY 50 miles away · crabgrass preventer May 12 – Jun 8
- Laramie, WY 77 miles away · crabgrass preventer May 20 – Jun 11
- Casper, WY 188 miles away · crabgrass preventer May 12 – May 29
- North Platte, NE 212 miles away · crabgrass preventer Apr 24 – May 14