| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°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 5a: -20°F to -15°F Zone 7a: 0°F to 5°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: | 11n - Deschutes River Valley |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 97754 - Prineville, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 24 | 26 | 28 | 34 | 40 | 43 | 42 | 36 | 30 | 26 | 21 | 31 |
| Avg Max Temp (°F) | 41 | 47 | 53 | 59 | 67 | 76 | 84 | 84 | 76 | 64 | 49 | 41 | 62 |
| Avg Precip (In.) | 1.21 | 1 | .95 | .82 | 1.08 | .85 | .57 | .49 | .42 | .77 | 1.32 | 1.23 | 10.71 |