Last frost date in Hermiston, Oregon
April 26
Average last frost in spring. In an early year (1 in 10) it's over by April 9; in a late year (1 in 10) it comes after May 10.
October 10
Average first frost in fall. 1 year in 10 it comes by September 25.
Source: NOAA U.S. Climate Normals 1991–2020, station Hermiston Muni AP (USW00004113), 1.3 miles from Hermiston, elevation 641 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 9 | Apr 26 | May 10 |
| First frost in fall | Sept 25 | Oct 10 | Oct 26 |
Frost-free days in an average year: 167
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 8 | Sept 28 |
| Frost (32°F) | Every year | Apr 26 | Oct 10 |
| Hard freeze (28°F) | Every year | Apr 9 | Oct 24 |
Nights at 32°F or colder in an average year: 115
What to plant now in Hermiston
- Spring planting calendar for an average last frost around April 30 Hermiston: April 26
- Fall planting calendar for an average first frost around October 10 Hermiston: October 10
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 Oregon
- Pendleton 25 mi · last frost Apr 22
- La Grande 68 mi · last frost May 6
- The Dalles 92 mi · last frost Apr 11
- Baker City 102 mi · last frost May 25
- Prineville 131 mi · last frost June 1
Updated