Bozeman, MT Lawn Care Calendar
In a typical year, put down crabgrass preventer in Bozeman between May 11 and Jun 8. The best time to overseed is between Jul 18 and Sep 6. The last spring frost usually comes around May 17. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).
Typical lawn care dates in Bozeman
| 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 11 – 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 18 – Sep 6 |
| Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F. | Jul 16 – Oct 17 |
Median dates, 2016–2025, from NOAA weather data for Bozeman. This year's dates can differ by a few weeks.
Month-by-month lawn care in Bozeman
- 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
- SeptemberOverseeding & seedingFall fertilizer
- OctoberFall fertilizer
- NovemberNo treatments due; mow as needed.
- DecemberNo treatments due; mow as needed.
Soil temperature in Bozeman by month
Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 23°F and peaks in July at 68°F. Crabgrass preventer goes down when it reaches 50°F, usually around May 11.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 23°F | 23°F | 32°F | 40°F | 50°F | 60°F | 68°F | 67°F | 59°F | 46°F | 34°F | 27°F |
Bozeman lawn timing, year by year
Over the last 10 years, soil in Bozeman reached 50°F, the signal for crabgrass preventer, as early as May 1 (2023) and as late as Jun 3 (2022): 33 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 17) and first fall frost (Oct 1), the growing season lasts about 137 days.
| Year | Crabgrass window opened | Last spring frost | First fall frost |
|---|---|---|---|
| 2025 | May 9 | Apr 23 | Oct 6 |
| 2024 | May 13 | May 25 | Oct 1 |
| 2023 | May 1 | Apr 29 | Oct 25 |
| 2022 | Jun 3 | May 22 | Oct 23 |
| 2021 | May 15 | May 23 | Sep 30 |
| 2020 | May 18 | May 11 | Sep 9 |
| 2019 | May 13 | May 11 | Sep 29 |
| 2018 | May 5 | Jun 13 | Sep 26 |
| 2017 | May 6 | May 20 | Sep 25 |
| 2016 | May 5 | May 12 | Oct 7 |
Estimated from daily temperatures for Bozeman. A dash means it didn't happen that year.
Frequently asked questions
When should I apply pre-emergent in Bozeman?
In a typical year, between May 11 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 Bozeman?
Early fall, typically Jul 18 – Sep 6, while soil cools from 65°F toward 50°F.
When is the last frost in Bozeman?
The median last spring frost is May 17 and the median first fall frost is Oct 1 (2016–2025).
How long is the growing season in Bozeman?
About 137 days, from the median last spring frost on May 17 to the median first fall frost on Oct 1 (2016–2025).
Lawn care guides
More Montana lawn calendars
Nearby cities in other states
- Idaho Falls, ID 159 miles away · crabgrass preventer May 3 – Jun 6
- Pocatello, ID 206 miles away · crabgrass preventer Apr 29 – May 22
- Sheridan, WY 208 miles away · crabgrass preventer May 8 – Jun 1
- Logan, UT 275 miles away · crabgrass preventer Apr 25 – May 20