Frost dates in Sisters, OR
The average last spring frost in Sisters is around July 7 and the first fall frost is around August 23. That gives Sisters an average growing season of about 47 days.
Last spring frost
| Early (10% chance after) | June 10 |
|---|---|
| Average (50%) | July 7 |
| Late (90%) | July 29 |
First fall frost
| Early (10%) | August 4 |
|---|---|
| Average (50%) | August 23 |
| Late (90% chance before) | September 12 |