| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| 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: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 83651 - Nampa, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 26 | 32 | 37 | 44 | 51 | 56 | 55 | 46 | 36 | 29 | 22 | 38 |
| Avg Max Temp (°F) | 37 | 45 | 56 | 64 | 73 | 82 | 90 | 89 | 79 | 66 | 49 | 38 | 64 |
| Avg Precip (In.) | 1.33 | 1.11 | 1.31 | 1.09 | 1.18 | .67 | .31 | .26 | .58 | .71 | 1.25 | 1.37 | 11.18 |