Frost dates in Index, WA
The average last spring frost in Index is around April 14 and the first fall frost is around October 28. That gives Index an average growing season of about 197 days.
Last spring frost
| Early (10% chance after) | March 23 |
|---|---|
| Average (50%) | April 14 |
| Late (90%) | May 11 |
First fall frost
| Early (10%) | October 3 |
|---|---|
| Average (50%) | October 28 |
| Late (90% chance before) | November 13 |