Last frost date in Walla Walla, Washington
March 27
Average last frost in spring. In an early year (1 in 10) it's over by March 3; in a late year (1 in 10) it comes after April 22.
October 31
Average first frost in fall. 1 year in 10 it comes by October 15.
Source: NOAA U.S. Climate Normals 1991–2020, station Walla Walla Rgnl AP (USW00024160), 3.1 miles from Walla Walla, elevation 1,166 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 3 | Mar 27 | Apr 22 |
| First frost in fall | Oct 15 | Oct 31 | Nov 17 |
Frost-free days in an average year: 219
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 21 | Oct 19 |
| Frost (32°F) | Every year | Mar 27 | Oct 31 |
| Hard freeze (28°F) | Every year | Mar 4 | Nov 14 |
Nights at 32°F or colder in an average year: 70
What to plant now in Walla Walla
- Corn saladSept 15 – Nov 1Now
- Upland cressSept 15 – Nov 1Now
- Rhubarb plantsNov 1 – Dec 1Soon
- Asparagus plantsNov 15 – Jan 1Soon
- Spring planting calendar for an average last frost around March 30 Walla Walla: March 27
- Fall planting calendar for an average first frost around October 30 Walla Walla: October 31
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 Washington
Updated