Frost dates in Herreid, SD
The average last spring frost in Herreid is around May 15 and the first fall frost is around September 21. That gives Herreid an average growing season of about 129 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 15 |
| Late (90%) | June 1 |
First fall frost
| Early (10%) | September 3 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 8 |