Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Billings | 5b | May 4 | Oct 7 | 156 |
| Bozeman | 5a | May 23 | Sep 23 | 123 |
| Missoula | 5b | May 16 | Sep 26 | 133 |
| Great Falls | 4b | May 17 | Sep 24 | 130 |
| Butte | 4b | Jun 5 | Sep 11 | 98 |
Zones in Montana
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. Montana's last-frost spread is
32 days wide. Use the location nearest you.
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