Frost dates in Irrigon, OR
The average last spring frost in Irrigon is around April 29 and the first fall frost is around October 13. That gives Irrigon an average growing season of about 167 days.
Last spring frost
| Early (10% chance after) | April 15 |
|---|---|
| Average (50%) | April 29 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | September 28 |
|---|---|
| Average (50%) | October 13 |
| Late (90% chance before) | October 30 |