Frost dates in Calvin, OK
The average last spring frost in Calvin is around March 22 and the first fall frost is around October 31. That gives Calvin an average growing season of about 223 days.
Last spring frost
| Early (10% chance after) | March 7 |
|---|---|
| Average (50%) | March 22 |
| Late (90%) | April 20 |
First fall frost
| Early (10%) | October 18 |
|---|---|
| Average (50%) | October 31 |
| Late (90% chance before) | November 20 |