| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 12a - Treasure Valley |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 83703 - Boise, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 27 | 32 | 37 | 44 | 51 | 57 | 56 | 48 | 39 | 30 | 23 | 39 |
| Avg Max Temp (°F) | 37 | 44 | 54 | 62 | 71 | 80 | 89 | 88 | 78 | 65 | 48 | 37 | 63 |
| Avg Precip (In.) | 1.43 | 1.21 | 1.4 | 1.22 | 1.24 | .75 | .33 | .31 | .7 | .77 | 1.41 | 1.41 | 12.19 |