Frost dates in Madison, SD
The average last spring frost in Madison is around May 4 and the first fall frost is around September 29. That gives Madison an average growing season of about 148 days.
Last spring frost
| Early (10% chance after) | April 21 |
|---|---|
| Average (50%) | May 4 |
| Late (90%) | May 16 |
First fall frost
| Early (10%) | September 19 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 13 |