| 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 | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Sep.1 - Sep. 10 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 12d - Dissected Plateaus and Teton Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 83420 - Ashton, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 20 | 29 | 36 | 42 | 46 | 45 | 36 | 28 | 19 | 9 | 28 |
| Avg Max Temp (°F) | 29 | 34 | 42 | 53 | 64 | 73 | 81 | 81 | 72 | 59 | 41 | 30 | 55 |
| Avg Precip (In.) | 2.22 | 1.7 | 1.61 | 1.49 | 2.43 | 1.68 | 1.12 | 1.08 | 1.19 | 1.41 | 2.02 | 2.24 | 20.19 |