Frost dates in Interior, SD
The average last spring frost in Interior is around May 3 and the first fall frost is around October 4. That gives Interior an average growing season of about 154 days.
Last spring frost
| Early (10% chance after) | April 21 |
|---|---|
| Average (50%) | May 3 |
| Late (90%) | May 14 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | October 4 |
| Late (90% chance before) | October 23 |