Frost dates in Yankton, SD
The average last spring frost in Yankton is around April 30 and the first fall frost is around October 5. That gives Yankton an average growing season of about 158 days.
Last spring frost
| Early (10% chance after) | April 15 |
|---|---|
| Average (50%) | April 30 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | September 22 |
|---|---|
| Average (50%) | October 5 |
| Late (90% chance before) | October 20 |