Last frost date in Windsor, Colorado
May 3
Average last frost in spring. In an early year (1 in 10) it's over by April 21; in a late year (1 in 10) it comes after May 15.
October 6
Average first frost in fall. 1 year in 10 it comes by September 22.
Source: NOAA U.S. Climate Normals 1991–2020, station Ft Collins 4 E (USC00053006), 8.8 miles from Windsor, elevation 4,920 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Severance, Timnath and Wellington, so their frost dates are the same as Windsor's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 21 | May 3 | May 15 |
| First frost in fall | Sept 22 | Oct 6 | Oct 17 |
Frost-free days in an average year: 154
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 14 | Sept 27 |
| Frost (32°F) | Every year | May 3 | Oct 6 |
| Hard freeze (28°F) | Every year | Apr 23 | Oct 14 |
Nights at 32°F or colder in an average year: 166
What to plant now in Windsor
- Spring planting calendar for an average last frost around April 30 Windsor: May 3
- Fall planting calendar for an average first frost around October 10 Windsor: October 6
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Colorado
- Greeley 9 mi · last frost May 2
- Loveland 9 mi · last frost May 10
- Fort Collins 9 mi · last frost May 2
- Longmont 24 mi · last frost May 7
- Boulder 36 mi · last frost May 6
Updated