| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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 |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| 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: | 12g - Eastern Snake River Basalt Plains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 83402 - Idaho Falls, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 24 | 31 | 39 | 46 | 51 | 49 | 40 | 31 | 22 | 12 | 31 |
| Avg Max Temp (°F) | 28 | 35 | 46 | 57 | 67 | 77 | 86 | 85 | 74 | 60 | 42 | 30 | 57 |
| Avg Precip (In.) | .89 | .82 | .99 | 1 | 1.62 | 1.11 | .67 | .75 | .79 | .96 | .94 | .91 | 11.46 |