Last frost date in Missoula, Montana
May 10
Average last frost in spring. In an early year (1 in 10) it's over by April 27; in a late year (1 in 10) it comes after May 28.
October 1
Average first frost in fall. 1 year in 10 it comes by September 16.
Source: NOAA U.S. Climate Normals 1991–2020, station Missoula 2 NE (USC00245735), 3.2 miles from Missoula, elevation 3,420 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 27 | May 10 | May 28 |
| First frost in fall | Sept 16 | Oct 1 | Oct 15 |
Frost-free days in an average year: 143
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | June 1 | Sept 19 |
| Frost (32°F) | Every year | May 10 | Oct 1 |
| Hard freeze (28°F) | Every year | Apr 28 | Oct 12 |
Nights at 32°F or colder in an average year: 163
What to plant now in Missoula
- Spring planting calendar for an average last frost around May 10 Missoula: May 10
- Fall planting calendar for an average first frost around September 30 Missoula: October 1
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
- Kalispell 94 mi · last frost May 31
- Butte-Silver Bow (balance) 94 mi · last frost June 13
- Helena 97 mi · last frost May 9
- Great Falls 135 mi · last frost May 6
- Belgrade 156 mi · last frost May 26