Frost dates in Willow Lake, SD
The average last spring frost in Willow Lake is around May 4 and the first fall frost is around November 1. That gives Willow Lake an average growing season of about 181 days.
Last spring frost
| Early (10% chance after) | February 18 |
|---|---|
| Average (50%) | May 4 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 5 |
|---|---|
| Average (50%) | November 1 |
| Late (90% chance before) | November 22 |