| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 43t - Shield-Smith Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 59086 - Wilsall, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 21 | 28 | 36 | 43 | 48 | 46 | 38 | 30 | 20 | 13 | 29 |
| Avg Max Temp (°F) | 32 | 37 | 44 | 53 | 63 | 72 | 81 | 81 | 69 | 57 | 41 | 34 | 55 |
| Avg Precip (In.) | .6 | .69 | 1.13 | 1.69 | 2.61 | 2.85 | 1.54 | 1.43 | 1.33 | 1 | .85 | .75 | 16.48 |