Frost dates in Napavine, WA
The average last spring frost in Napavine is around May 5 and the first fall frost is around October 7. That gives Napavine an average growing season of about 155 days.
Last spring frost
| Early (10% chance after) | April 10 |
|---|---|
| Average (50%) | May 5 |
| Late (90%) | May 26 |
First fall frost
| Early (10%) | September 15 |
|---|---|
| Average (50%) | October 7 |
| Late (90% chance before) | October 27 |