Sheridan, WY Lawn Care Calendar
In a typical year, put down crabgrass preventer in Sheridan between May 8 and Jun 1. The best time to overseed is between Jul 18 and Sep 6. The last spring frost usually comes around May 11. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Sheridan
| 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 8 – Jun 1 |
| Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing. | May 25 – Jun 29 |
| Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost. | Jul 18 – Sep 6 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Aug 11 – Oct 21 |
Median dates, 2016–2025, from NOAA weather data for Sheridan. This year's dates can differ by a few weeks.
Month-by-month lawn care in Sheridan
- 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)Spring fertilizer
- JuneCrabgrass preventer (pre-emergent)Spring 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 Sheridan by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in February at 22°F and peaks in July at 71°F. Crabgrass preventer goes down when it reaches 50°F, usually around May 8.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 23°F | 22°F | 34°F | 42°F | 52°F | 63°F | 71°F | 70°F | 61°F | 47°F | 36°F | 27°F |
Sheridan lawn timing, year by year
Over the last 10 years, soil in Sheridan reached 50°F, the signal for crabgrass preventer, as early as Apr 30 (2020) and as late as May 16 (2022): 16 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 11) and first fall frost (Oct 1), the growing season lasts about 143 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | May 9 | May 7 | Sep 6 |
| 2024 | May 12 | May 5 | Oct 1 |
| 2023 | May 1 | Apr 25 | Oct 14 |
| 2022 | May 16 | May 25 | Oct 9 |
| 2021 | May 15 | May 11 | Sep 30 |
| 2020 | Apr 30 | May 10 | Sep 9 |
| 2019 | May 14 | Jun 9 | Oct 3 |
| 2018 | May 5 | Apr 26 | Sep 26 |
| 2017 | May 6 | May 20 | Sep 17 |
| 2016 | May 5 | May 12 | Oct 5 |
Estimated from daily temperatures for Sheridan. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Sheridan?
In a typical year, between May 8 and Jun 1. 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 Sheridan?
Early fall, typically Jul 18 – Sep 6, while soil cools from 65°F toward 50°F.
When is the last frost in Sheridan?
The median last spring frost is May 11 and the median first fall frost is Oct 1 (2016–2025).
How long is the growing season in Sheridan?
About 143 days, from the median last spring frost on May 11 to the median first fall frost on Oct 1 (2016–2025).
Lawn care guides
More Wyoming lawn calendars
Nearby cities in other states
- Billings, MT 101 miles away · crabgrass preventer Apr 30 – May 15
- Rapid City, SD 191 miles away · crabgrass preventer May 4 – May 23
- Bozeman, MT 208 miles away · crabgrass preventer May 11 – Jun 8
- Idaho Falls, ID 267 miles away · crabgrass preventer May 3 – Jun 6