Last frost date in Bozeman, Montana
May 26
Average last frost in spring. In an early year (1 in 10) it's over by May 9; in a late year (1 in 10) it comes after June 14.
September 22
Average first frost in fall. 1 year in 10 it comes by September 5.
Source: NOAA U.S. Climate Normals 1991–2020, station Bozeman Montana State Univ (USC00241044), 1.5 miles from Bozeman, elevation 4,913 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 9 | May 26 | June 14 |
| First frost in fall | Sept 5 | Sept 22 | Oct 5 |
Frost-free days in an average year: 116
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | June 14 | Sept 8 |
| Frost (32°F) | Every year | May 26 | Sept 22 |
| Hard freeze (28°F) | Every year | May 8 | Oct 3 |
Nights at 32°F or colder in an average year: 178
What to plant now in Bozeman
- Spring planting calendar for an average last frost around May 30 Bozeman: May 26
- Fall planting calendar for an average first frost around September 20 Bozeman: September 22
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Montana
- Belgrade 9 mi · last frost May 26
- Helena 78 mi · last frost May 9
- Butte-Silver Bow (balance) 79 mi · last frost June 13
- Billings 121 mi · last frost May 4
- Great Falls 126 mi · last frost May 6
Updated