Gardner, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.7 °F (low) to 62.4 °F (high). Annual precipitation averages 13.5 Inches. Gardner is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.3 °F | 42.4 °F | 0.51 in. |
| February | 17.3 °F | 45.0 °F | 0.5 in. |
| March | 24.0 °F | 53.2 °F | 1.03 in. |
| April | 30.2 °F | 59.1 °F | 1.38 in. |
| May | 38.8 °F | 68.9 °F | 1.38 in. |
| June | 47.4 °F | 80.2 °F | 0.99 in. |
| July | 53.0 °F | 84.1 °F | 2.42 in. |
| August | 51.1 °F | 81.6 °F | 2.14 in. |
| September | 43.7 °F | 75.5 °F | 0.84 in. |
| October | 32.8 °F | 64.4 °F | 1.02 in. |
| November | 23.4 °F | 52.3 °F | 0.71 in. |
| December | 15.3 °F | 42.2 °F | 0.54 in. |
| Annual | 32.7 °F | 62.4 °F | 13.46 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |