| 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 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. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 11k - Blue Mountain Basins |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 97850 - La Grande, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 26 | 30 | 34 | 41 | 46 | 51 | 51 | 44 | 35 | 29 | 23 | 36 |
| Avg Max Temp (°F) | 36 | 42 | 49 | 56 | 65 | 73 | 82 | 83 | 74 | 61 | 44 | 37 | 59 |
| Avg Precip (In.) | 1.81 | 1.3 | 1.48 | 1.75 | 1.76 | 1.51 | .61 | .81 | .7 | 1.15 | 2.1 | 1.82 | 16.8 |