Frost dates in Heppner, OR
The average last spring frost in Heppner is around May 6 and the first fall frost is around October 10. That gives Heppner an average growing season of about 157 days.
Last spring frost
| Early (10% chance after) | April 16 |
|---|---|
| Average (50%) | May 6 |
| Late (90%) | May 27 |
First fall frost
| Early (10%) | September 24 |
|---|---|
| Average (50%) | October 10 |
| Late (90% chance before) | October 28 |