Montana Frost Dates
Montana gardening often means working within a short season shaped by elevation, open exposure, and sharp day-to-day shifts. Frost can arrive late in spring and early in fall almost anywhere, though some valleys and plains pockets behave better than mountain basins and high country.
Look up your exact frost dates
Frost timing shifts across Montana with elevation and distance from water. Enter your ZIP code for dates from your nearest weather station.
Montana locations
| ZIP | Area | Hardiness zone |
|---|---|---|
| 57724 | Camp Crook | 4b |
| 59019 | Columbus | 5a |
| 59035 | Fort Smith | 5a |
| 59067 | Rapelje | 4b |
| 59081 | Silver Gate | 4a |
| 59102 | Billings | 5a |
| 59231 | St. Marie | 4a |
| 59330 | West Glendive | 4a |
| 59401 | Great Falls | 4b |
| 59483 | Fort Shaw | 4a |
| 59546 | Zortman | 4b |
| 59638 | Jefferson City | 4b |
| 59710 | Alder | 5a |
| 59732 | Glen | 4b |
| 59755 | Virginia City | 5a |
| 59802 | Missoula | 5b |
| 59868 | Seeley Lake | 5a |
| 59870 | Stevensville | 5b |
| 59926 | Martin City | 5b |
| 59928 | Polebridge | 5a |
| 57717 | Belle Fourche | 4b |
| 58621 | Beach | 4a |
| 59001 | Absarokee | 5a |
| 59002 | Mountain View Colony | 5a |
| 59003 | Ashland | 4b |
| 59006 | Ballantine | 4b |
| 59007 | Bearcreek | 5a |
| 59008 | Belfry | 5a |
| 59010 | Custer | 4b |
| 59011 | Big Timber | 5a |
| 59012 | Birney | 4b |
| 59013 | Boyd | 5a |
| 59014 | Frannie | 5a |
| 59015 | Broadview | 4b |
| 59016 | Busby | 5a |
| 59018 | Clyde Park | 5a |
| 59020 | Silver Gate | 4b |
| 59022 | Crow Agency | 4b |
| 59024 | Custer | 4b |
| 59025 | Sheridan | 5a |
| 59026 | Edgar | 5a |
| 59027 | South Glastonbury | 5a |
| 59028 | Nye | 5a |
| 59029 | Fromberg | 5a |
| 59030 | Jardine | 4b |
| 59031 | Crow Agency | 4b |
| 59032 | Grass Range | 4b |
| 59033 | Greycliff | 5a |
| 59034 | Hardin | 4b |
| 59036 | Harlowton | 4b |
| 59037 | Huntley | 4b |
| 59038 | Hysham | 4b |
| 59039 | Hysham | 4b |
| 59041 | Joliet | 5a |
| 59043 | Muddy | 5a |
| 59044 | Laurel | 5a |
| 59046 | Lavina | 4b |
| 59047 | Wineglass | 5a |
| 59050 | Forty Mile Colony | 5a |
| 59052 | Nye | 5a |
Source: NOAA 1991–2020 U.S. Climate Normals (public domain) and USDA 2023 Plant Hardiness Zone Map. Page updated Aug 4, 2026.