Frost dates in Umatilla, OR
The average last spring frost in Umatilla is around March 23 and the first fall frost is around November 2. That gives Umatilla an average growing season of about 224 days.
Last spring frost
| Early (10% chance after) | March 6 |
|---|---|
| Average (50%) | March 23 |
| Late (90%) | April 25 |
First fall frost
| Early (10%) | October 13 |
|---|---|
| Average (50%) | November 2 |
| Late (90% chance before) | November 24 |