| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| 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 83211 - American Falls, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 21 | 27 | 34 | 41 | 48 | 54 | 53 | 44 | 35 | 26 | 18 | 35 |
| Avg Max Temp (°F) | 32 | 39 | 49 | 59 | 68 | 78 | 86 | 86 | 75 | 62 | 44 | 34 | 59 |
| Avg Precip (In.) | 1.09 | .96 | 1.35 | 1.19 | 1.6 | .95 | .62 | .61 | .82 | .95 | 1.17 | 1.04 | 12.36 |