| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°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 7a: 0°F to 5°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| 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: | 12h - Mountain Home Uplands |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 83716 - Boise, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 31 | 37 | 44 | 50 | 56 | 55 | 47 | 37 | 27 | 21 | 38 |
| Avg Max Temp (°F) | 38 | 44 | 54 | 63 | 71 | 81 | 90 | 90 | 80 | 65 | 47 | 38 | 63 |
| Avg Precip (In.) | 1.57 | 1.25 | 1.47 | 1.31 | 1.24 | .81 | .36 | .3 | .71 | .81 | 1.6 | 1.6 | 13.04 |