Cheyenne, WY Lawn Care Calendar
In a typical year, put down crabgrass preventer in Cheyenne between May 12 and Jun 8. The best time to overseed is between Jul 22 and Sep 10. The last spring frost usually comes around May 13. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Cheyenne
| Task | Typical window |
|---|---|
| Crabgrass preventer (pre-emergent)Crabgrass sprouts once soil stays above 55°F. Apply when soil reaches 50°F, before that happens. | May 12 – Jun 8 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | Jun 1 – Jul 6 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Jul 22 – Sep 10 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Aug 1 – Oct 27 |
Median dates, 2016–2025, from NOAA weather data for Cheyenne. This year's dates can differ by a few weeks.
Month-by-month lawn care in Cheyenne
- JanuaryNo treatments due; mow as needed.
- FebruaryNo treatments due; mow as needed.
- MarchNo treatments due; mow as needed.
- AprilNo treatments due; mow as needed.
- MayCrabgrass preventer (pre-emergent)
- JuneCrabgrass preventer (pre-emergent)Spring fertilizer
- JulySpring fertilizerOverseeding & seeding
- AugustOverseeding & seedingFall fertilizer
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberNo treatments due; mow as needed.
- DecemberNo treatments due; mow as needed.
Soil temperature in Cheyenne by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 27°F and peaks in July at 70°F. Crabgrass preventer goes down when it reaches 50°F, usually around May 12.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 27°F | 28°F | 35°F | 41°F | 50°F | 63°F | 70°F | 68°F | 62°F | 48°F | 38°F | 32°F |
Cheyenne lawn timing, year by year
Over the last 10 years, soil in Cheyenne reached 50°F, the signal for crabgrass preventer, as early as May 1 (2020) and as late as May 21 (2016): 20 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 13) and first fall frost (Oct 5), the growing season lasts about 145 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | May 10 | May 22 | Oct 13 |
| 2024 | May 15 | May 11 | Oct 25 |
| 2023 | May 4 | Apr 29 | Oct 7 |
| 2022 | May 7 | May 23 | Oct 17 |
| 2021 | May 19 | May 13 | Oct 13 |
| 2020 | May 1 | May 12 | Sep 8 |
| 2019 | May 15 | May 22 | Oct 3 |
| 2018 | May 6 | Apr 27 | Sep 26 |
| 2017 | May 13 | May 20 | Oct 3 |
| 2016 | May 21 | May 12 | Sep 10 |
Estimated from daily temperatures for Cheyenne. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Cheyenne?
In a typical year, between May 12 and Jun 8. 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 Cheyenne?
Early fall, typically Jul 22 – Sep 10, while soil cools from 65°F toward 50°F.
When is the last frost in Cheyenne?
The median last spring frost is May 13 and the median first fall frost is Oct 5 (2016–2025).
How long is the growing season in Cheyenne?
About 145 days, from the median last spring frost on May 13 to the median first fall frost on Oct 5 (2016–2025).
Lawn care guides
More Wyoming lawn calendars
Nearby cities in other states
- Fort Collins, CO 40 miles away · crabgrass preventer Apr 21 – May 19
- Greeley, CO 50 miles away · crabgrass preventer Apr 23 – May 17
- Boulder, CO 82 miles away · crabgrass preventer Apr 13 – May 17
- Denver, CO 97 miles away · crabgrass preventer Apr 8 – May 11