| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°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 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 12e - Upper Snake River Plain |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 83221 - Blackfoot, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 18 | 25 | 31 | 38 | 45 | 50 | 49 | 41 | 32 | 23 | 14 | 32 |
| Avg Max Temp (°F) | 31 | 37 | 48 | 58 | 68 | 77 | 85 | 85 | 75 | 62 | 44 | 32 | 58 |
| Avg Precip (In.) | .91 | .79 | .88 | .94 | 1.38 | .92 | .55 | .46 | .73 | .86 | .85 | .78 | 10.06 |