Last frost date in Casper, Wyoming
May 10
Average last frost in spring. In an early year (1 in 10) it's over by April 30; in a late year (1 in 10) it comes after May 24.
September 29
Average first frost in fall. 1 year in 10 it comes by September 14.
Source: NOAA U.S. Climate Normals 1991–2020, station Casper Wwtp (USC00481569), 2 miles from Casper, elevation 5,097 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 30 | May 10 | May 24 |
| First frost in fall | Sept 14 | Sept 29 | Oct 12 |
Frost-free days in an average year: 138
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 23 | Sept 19 |
| Frost (32°F) | Every year | May 10 | Sept 29 |
| Hard freeze (28°F) | Every year | May 1 | Oct 6 |
Nights at 32°F or colder in an average year: 163
What to plant now in Casper
- Spring planting calendar for an average last frost around May 10 Casper: May 10
- Fall planting calendar for an average first frost around September 30 Casper: September 29
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 Wyoming
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