Fort Collins, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.7 °F (low) to 63.1 °F (high). Annual precipitation averages 15.8 Inches. Fort Collins is located in USDA Plant Hardiness Zone 5b. 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 | 15.5 °F | 42.3 °F | 0.43 in. |
| February | 17.5 °F | 44.1 °F | 0.47 in. |
| March | 25.4 °F | 54.1 °F | 1.27 in. |
| April | 32.5 °F | 60.5 °F | 1.96 in. |
| May | 42.2 °F | 69.0 °F | 2.94 in. |
| June | 51.5 °F | 80.8 °F | 1.77 in. |
| July | 57.0 °F | 87.0 °F | 1.71 in. |
| August | 54.7 °F | 84.7 °F | 1.4 in. |
| September | 46.2 °F | 77.2 °F | 1.45 in. |
| October | 34.3 °F | 63.7 °F | 1.24 in. |
| November | 23.7 °F | 51.3 °F | 0.72 in. |
| December | 15.4 °F | 41.9 °F | 0.47 in. |
| Annual | 34.7 °F | 63.1 °F | 15.83 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |