Last frost date in Green River, Wyoming
May 24
Average last frost in spring. In an early year (1 in 10) it's over by May 7; in a late year (1 in 10) it comes after June 10.
September 22
Average first frost in fall. 1 year in 10 it comes by September 7.
Source: NOAA U.S. Climate Normals 1991–2020, station Green Rvr (USC00484065), 0.3 miles from Green River, elevation 6,160 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 7 | May 24 | June 10 |
| First frost in fall | Sept 7 | Sept 22 | Oct 6 |
Frost-free days in an average year: 120
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | June 7 | Sept 13 |
| Frost (32°F) | Every year | May 24 | Sept 22 |
| Hard freeze (28°F) | Every year | May 9 | Oct 3 |
Nights at 32°F or colder in an average year: 200
What to plant now in Green River
- Spring planting calendar for an average last frost around May 20 Green River: May 24
- Fall planting calendar for an average first frost around September 20 Green River: September 22
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
- Rock Springs 14 mi · last frost May 24
- Evanston 79 mi · last frost June 12
- Riverton 118 mi · last frost May 12
- Jackson 151 mi · last frost June 20
- Casper 186 mi · last frost May 10
Updated