Frost dates in Coulee City, WA
The average last spring frost in Coulee City is around May 8 and the first fall frost is around October 7. That gives Coulee City an average growing season of about 152 days.
Last spring frost
| Early (10% chance after) | April 15 |
|---|---|
| Average (50%) | May 8 |
| Late (90%) | June 1 |
First fall frost
| Early (10%) | September 19 |
|---|---|
| Average (50%) | October 7 |
| Late (90% chance before) | October 26 |