Hayden, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36 °F (low) to 57.7 °F (high). Annual precipitation averages 25.6 Inches. Hayden is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.2 °F | 35.6 °F | 3.43 in. |
| February | 24.2 °F | 39.7 °F | 2.15 in. |
| March | 28.4 °F | 48.0 °F | 2.59 in. |
| April | 33.6 °F | 56.3 °F | 2.09 in. |
| May | 41.0 °F | 66.1 °F | 2.11 in. |
| June | 46.8 °F | 71.9 °F | 1.8 in. |
| July | 51.6 °F | 82.7 °F | 0.72 in. |
| August | 50.9 °F | 83.3 °F | 0.66 in. |
| September | 43.4 °F | 73.2 °F | 0.83 in. |
| October | 35.2 °F | 57.8 °F | 2.3 in. |
| November | 29.1 °F | 43.3 °F | 3.22 in. |
| December | 23.9 °F | 34.7 °F | 3.68 in. |
| Annual | 36 °F | 57.7 °F | 25.58 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |