Frost dates in Coulee Dam, WA
The average last spring frost in Coulee Dam is around April 21 and the first fall frost is around October 21. That gives Coulee Dam an average growing season of about 183 days.
Last spring frost
| Early (10% chance after) | April 2 |
|---|---|
| Average (50%) | April 21 |
| Late (90%) | May 8 |
First fall frost
| Early (10%) | October 10 |
|---|---|
| Average (50%) | October 21 |
| Late (90% chance before) | November 5 |