| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 5a: -20°F to -15°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 7a: 0°F to 5°F Zone 4b: -25°F to -20°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: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 12h - Mountain Home Uplands |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 83623 - Glenns Ferry, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 24 | 29 | 34 | 41 | 48 | 54 | 51 | 42 | 33 | 26 | 20 | 35 |
| Avg Max Temp (°F) | 39 | 47 | 57 | 66 | 75 | 85 | 95 | 93 | 82 | 69 | 51 | 40 | 67 |
| Avg Precip (In.) | 1.42 | 1.01 | 1.05 | .63 | .82 | .59 | .28 | .27 | .49 | .69 | 1.24 | 1.28 | 9.78 |