| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 17w - Townsend Basin |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 59718 - Bozeman, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 23 | 30 | 38 | 45 | 49 | 48 | 40 | 32 | 21 | 13 | 31 |
| Avg Max Temp (°F) | 33 | 38 | 46 | 55 | 64 | 74 | 82 | 82 | 71 | 59 | 42 | 34 | 57 |
| Avg Precip (In.) | .67 | .58 | 1.16 | 1.67 | 2.85 | 2.55 | 1.35 | 1.36 | 1.49 | 1.27 | .82 | .64 | 16.4 |