| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 15c - Flathead Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 59911 - Bigfork, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 19 | 25 | 32 | 39 | 45 | 49 | 48 | 39 | 31 | 25 | 18 | 32 |
| Avg Max Temp (°F) | 30 | 36 | 45 | 55 | 64 | 72 | 79 | 79 | 68 | 55 | 40 | 32 | 55 |
| Avg Precip (In.) | 1.42 | 1.21 | 1.29 | 1.56 | 2.47 | 2.75 | 1.68 | 1.45 | 1.53 | 1.23 | 1.58 | 1.66 | 19.84 |