| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep.1 - Sep. 10 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 12e - Upper Snake River Plain |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 83401 - Idaho Falls, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 24 | 31 | 38 | 45 | 50 | 49 | 40 | 31 | 22 | 12 | 31 |
| Avg Max Temp (°F) | 29 | 35 | 46 | 57 | 67 | 77 | 86 | 85 | 74 | 61 | 42 | 30 | 57 |
| Avg Precip (In.) | 1.05 | .89 | 1.09 | 1.06 | 1.79 | 1.14 | .72 | .81 | .84 | 1.01 | 1.02 | 1.01 | 12.43 |