Highlands Ranch, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 36.4 °F (low) to 64.3 °F (high). Annual precipitation averages 17.7 Inches. Highlands Ranch 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.4 °F | 45.6 °F | 0.63 in. |
| February | 19.6 °F | 46.5 °F | 0.68 in. |
| March | 27.1 °F | 54.9 °F | 1.49 in. |
| April | 33.4 °F | 60.5 °F | 2.37 in. |
| May | 42.6 °F | 69.2 °F | 2.38 in. |
| June | 52.1 °F | 81.2 °F | 1.91 in. |
| July | 58.4 °F | 87.3 °F | 1.91 in. |
| August | 56.6 °F | 85.0 °F | 2.14 in. |
| September | 48.1 °F | 77.7 °F | 1.53 in. |
| October | 35.8 °F | 64.9 °F | 1.19 in. |
| November | 26.3 °F | 53.7 °F | 0.9 in. |
| December | 18.2 °F | 44.9 °F | 0.61 in. |
| Annual | 36.4 °F | 64.3 °F | 17.74 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 6a : -10°F to -5°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 |