| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°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 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Sep.1 - Sep. 10 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 10c - Umatilla Plateau |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 97868 - Pilot Rock, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 29 | 33 | 37 | 42 | 48 | 53 | 53 | 45 | 37 | 32 | 26 | 38 |
| Avg Max Temp (°F) | 42 | 48 | 55 | 62 | 70 | 78 | 87 | 87 | 78 | 65 | 50 | 42 | 64 |
| Avg Precip (In.) | 1.35 | 1.18 | 1.56 | 1.45 | 1.62 | 1.14 | .41 | .62 | .71 | .98 | 1.71 | 1.38 | 14.11 |