Frost dates in Portland, OR
The average last spring frost in Portland is around March 3 and the first fall frost is around November 28. That gives Portland an average growing season of about 270 days.
Last spring frost
| Early (10% chance after) | January 22 |
|---|---|
| Average (50%) | March 3 |
| Late (90%) | March 22 |
First fall frost
| Early (10%) | November 2 |
|---|---|
| Average (50%) | November 28 |
| Late (90% chance before) | December 18 |