Frost dates in Cosmopolis, WA
The average last spring frost in Cosmopolis is around April 16 and the first fall frost is around November 4. That gives Cosmopolis an average growing season of about 202 days.
Last spring frost
| Early (10% chance after) | March 20 |
|---|---|
| Average (50%) | April 16 |
| Late (90%) | May 6 |
First fall frost
| Early (10%) | October 11 |
|---|---|
| Average (50%) | November 4 |
| Late (90% chance before) | December 3 |