Idaho Springs, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.5 °F (low) to 57.3 °F (high). Annual precipitation averages 17.6 Inches. Idaho Springs is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.4 °F | 39.2 °F | 0.64 in. |
| February | 15.0 °F | 40.4 °F | 0.67 in. |
| March | 21.0 °F | 47.8 °F | 1.34 in. |
| April | 26.5 °F | 53.1 °F | 2.12 in. |
| May | 34.4 °F | 61.8 °F | 2.41 in. |
| June | 41.9 °F | 73.5 °F | 1.73 in. |
| July | 48.0 °F | 79.4 °F | 2.44 in. |
| August | 46.5 °F | 77.2 °F | 2.06 in. |
| September | 39.1 °F | 70.6 °F | 1.59 in. |
| October | 30.0 °F | 58.7 °F | 1.1 in. |
| November | 21.7 °F | 47.2 °F | 0.81 in. |
| December | 14.9 °F | 38.9 °F | 0.66 in. |
| Annual | 29.5 °F | 57.3 °F | 17.57 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |