Frost dates in Richland, OR
The average last spring frost in Richland is around May 16 and the first fall frost is around September 26. That gives Richland an average growing season of about 133 days.
Last spring frost
| Early (10% chance after) | April 25 |
|---|---|
| Average (50%) | May 16 |
| Late (90%) | June 6 |
First fall frost
| Early (10%) | September 12 |
|---|---|
| Average (50%) | September 26 |
| Late (90% chance before) | October 11 |