| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 4a - Western Cascades Lowlands and Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98675 - Yacolt, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 33 | 36 | 38 | 43 | 48 | 51 | 51 | 47 | 41 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 44 | 49 | 54 | 59 | 66 | 71 | 78 | 79 | 74 | 63 | 51 | 44 | 61 |
| Avg Precip (In.) | 10.27 | 8.54 | 7.49 | 5.49 | 3.96 | 3.01 | 1.18 | 1.67 | 3.23 | 5.94 | 10.65 | 12.2 | 73.61 |