Frost dates in Riddle, OR
The average last spring frost in Riddle is around April 20 and the first fall frost is around October 25. That gives Riddle an average growing season of about 188 days.
Last spring frost
| Early (10% chance after) | March 27 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 28 |
|---|---|
| Average (50%) | October 25 |
| Late (90% chance before) | December 1 |