Frost dates in Duncan, OK
The average last spring frost in Duncan is around March 27 and the first fall frost is around November 8. That gives Duncan an average growing season of about 226 days.
Last spring frost
| Early (10% chance after) | March 7 |
|---|---|
| Average (50%) | March 27 |
| Late (90%) | April 12 |
First fall frost
| Early (10%) | October 26 |
|---|---|
| Average (50%) | November 8 |
| Late (90% chance before) | November 22 |