Frost dates · 4 cities · zones 4b–5b
Montana frost dates, city by city
Median last spring frost across 4 Montana cities runs from May 5 in Billings to May 23 in Bozeman.
| City | Zone | Last frost median | First frost median | Season | Jan → Dec |
|---|---|---|---|---|---|
| Billings | 5a | May 5 | Oct 3 | 149 d | |
| Missoula | 5b | May 10 | Oct 1 | 143 d | |
| Great Falls | 4b | May 6 | Oct 1 | 147 d | |
| Bozeman | 5a | May 23 | Sep 23 | 123 d |
Medians from NOAA NCEI 1991–2020 U.S. Climate Normals at each city's nearest qualifying station; zones from the 2023 USDA Plant Hardiness Zone Map. Open a city for the 1-in-10-year dates, the station, and a planting calendar for every sauce crop.
All states →Build a plan from your ZIP →Earliest: Billings (May 5) · Latest: Bozeman (May 23)