Frost dates in Sultan, WA
The average last spring frost in Sultan is around April 21 and the first fall frost is around October 21. That gives Sultan an average growing season of about 183 days.
Last spring frost
| Early (10% chance after) | March 29 |
|---|---|
| Average (50%) | April 21 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 21 |
| Late (90% chance before) | November 14 |