Frost dates in Helena, OK
The average last spring frost in Helena is around April 10 and the first fall frost is around October 29. That gives Helena an average growing season of about 202 days.
Last spring frost
| Early (10% chance after) | March 29 |
|---|---|
| Average (50%) | April 10 |
| Late (90%) | April 26 |
First fall frost
| Early (10%) | October 16 |
|---|---|
| Average (50%) | October 29 |
| Late (90% chance before) | November 13 |