Frost dates in St. John, WA
The average last spring frost in St. John is around May 18 and the first fall frost is around September 21. That gives St. John an average growing season of about 126 days.
Last spring frost
| Early (10% chance after) | April 28 |
|---|---|
| Average (50%) | May 18 |
| Late (90%) | June 27 |
First fall frost
| Early (10%) | September 4 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 13 |