| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°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 83655 - New Plymouth, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 25 | 31 | 37 | 45 | 52 | 57 | 55 | 45 | 36 | 28 | 21 | 38 |
| Avg Max Temp (°F) | 36 | 44 | 56 | 65 | 74 | 83 | 91 | 90 | 80 | 66 | 48 | 37 | 64 |
| Avg Precip (In.) | 1.43 | 1.09 | 1.15 | .88 | 1.07 | .77 | .32 | .36 | .55 | .69 | 1.32 | 1.5 | 11.14 |