Laramie, WY Lawn Care Calendar
In a typical year, put down crabgrass preventer in Laramie between May 20 and Jun 11. The best time to overseed is between Jul 10 and Aug 29. The last spring frost usually comes around May 25. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Laramie
| 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 20 – Jun 11 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | Jun 4 – Jul 9 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Jul 10 – Aug 29 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Jul 16 – Oct 21 |
Median dates, 2016–2025, from NOAA weather data for Laramie. This year's dates can differ by a few weeks.
Month-by-month lawn care in Laramie
- 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 & seedingFall fertilizer
- AugustOverseeding & seedingFall fertilizer
- SeptemberFall fertilizer
- OctoberFall fertilizer
- NovemberNo treatments due; mow as needed.
- DecemberNo treatments due; mow as needed.
Soil temperature in Laramie by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 22°F and peaks in July at 67°F. Crabgrass preventer goes down when it reaches 50°F, usually around May 20.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 22°F | 25°F | 32°F | 38°F | 48°F | 61°F | 67°F | 65°F | 58°F | 45°F | 35°F | 27°F |
Laramie lawn timing, year by year
Over the last 10 years, soil in Laramie reached 50°F, the signal for crabgrass preventer, as early as May 7 (2018) and as late as Jun 3 (2019): 27 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 25) and first fall frost (Sep 23), the growing season lasts about 121 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | May 31 | May 20 | Oct 7 |
| 2024 | May 28 | May 24 | Oct 19 |
| 2023 | May 17 | Apr 29 | Oct 7 |
| 2022 | May 16 | May 25 | Sep 12 |
| 2021 | May 20 | May 13 | Sep 21 |
| 2020 | May 18 | May 25 | Sep 8 |
| 2019 | Jun 3 | Jun 10 | Oct 2 |
| 2018 | May 7 | May 20 | Sep 25 |
| 2017 | May 13 | May 28 | Sep 17 |
| 2016 | May 31 | May 26 | Sep 10 |
Estimated from daily temperatures for Laramie. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Laramie?
In a typical year, between May 20 and Jun 11. 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 Laramie?
Early fall, typically Jul 10 – Aug 29, while soil cools from 65°F toward 50°F.
When is the last frost in Laramie?
The median last spring frost is May 25 and the median first fall frost is Sep 23 (2016–2025).
How long is the growing season in Laramie?
About 121 days, from the median last spring frost on May 25 to the median first fall frost on Sep 23 (2016–2025).
Lawn care guides
More Wyoming lawn calendars
Nearby cities in other states
- Fort Collins, CO 56 miles away · crabgrass preventer Apr 21 – May 19
- Greeley, CO 77 miles away · crabgrass preventer Apr 23 – May 17
- Boulder, CO 91 miles away · crabgrass preventer Apr 13 – May 17
- Denver, CO 113 miles away · crabgrass preventer Apr 8 – May 11