Frost dates in Ione, WA
The average last spring frost in Ione is around July 3 and the first fall frost is around August 23. That gives Ione an average growing season of about 51 days.
Last spring frost
| Early (10% chance after) | June 8 |
|---|---|
| Average (50%) | July 3 |
| Late (90%) | July 21 |
First fall frost
| Early (10%) | August 10 |
|---|---|
| Average (50%) | August 23 |
| Late (90% chance before) | September 6 |