Frost dates in Henry, SD
The average last spring frost in Henry is around May 12 and the first fall frost is around September 29. That gives Henry an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | April 24 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 17 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 12 |