Frost dates in St. Lawrence, SD
The average last spring frost in St. Lawrence is around May 12 and the first fall frost is around September 29. That gives St. Lawrence an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | April 25 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 13 |