Highlands Ranch, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.4 °C (low) to 17.9 °C (high). Annual precipitation averages 450.6 Millimeters. 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 | -7.6 °C | 7.6 °C | 16 mm |
| February | -6.9 °C | 8.1 °C | 17.27 mm |
| March | -2.7 °C | 12.7 °C | 37.85 mm |
| April | 0.8 °C | 15.8 °C | 60.2 mm |
| May | 5.9 °C | 20.7 °C | 60.45 mm |
| June | 11.2 °C | 27.3 °C | 48.51 mm |
| July | 14.7 °C | 30.7 °C | 48.51 mm |
| August | 13.7 °C | 29.4 °C | 54.36 mm |
| September | 8.9 °C | 25.4 °C | 38.86 mm |
| October | 2.1 °C | 18.3 °C | 30.23 mm |
| November | -3.2 °C | 12.1 °C | 22.86 mm |
| December | -7.7 °C | 7.2 °C | 15.49 mm |
| Annual | 2.4 °C | 17.9 °C | 450.59 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |