Frost dates in Monmouth, OR
The average last spring frost in Monmouth is around April 28 and the first fall frost is around October 25. That gives Monmouth an average growing season of about 180 days.
Last spring frost
| Early (10% chance after) | April 5 |
|---|---|
| Average (50%) | April 28 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 30 |
|---|---|
| Average (50%) | October 25 |
| Late (90% chance before) | November 17 |