Frost dates in Walla Walla, WA
The average last spring frost in Walla Walla is around April 3 and the first fall frost is around October 30. That gives Walla Walla an average growing season of about 210 days.
Last spring frost
| Early (10% chance after) | March 14 |
|---|---|
| Average (50%) | April 3 |
| Late (90%) | April 21 |
First fall frost
| Early (10%) | October 12 |
|---|---|
| Average (50%) | October 30 |
| Late (90% chance before) | November 16 |