Frost dates in Union, OR
The average last spring frost in Union is around May 24 and the first fall frost is around September 19. That gives Union an average growing season of about 118 days.
Last spring frost
| Early (10% chance after) | May 6 |
|---|---|
| Average (50%) | May 24 |
| Late (90%) | June 12 |
First fall frost
| Early (10%) | September 3 |
|---|---|
| Average (50%) | September 19 |
| Late (90% chance before) | October 6 |