Frost dates in Ritzville, WA
The average last spring frost in Ritzville is around May 15 and the first fall frost is around October 2. That gives Ritzville an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | April 26 |
|---|---|
| Average (50%) | May 15 |
| Late (90%) | June 2 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | October 2 |
| Late (90% chance before) | October 21 |