Frost dates in Lebanon, SD
The average last spring frost in Lebanon is around May 11 and the first fall frost is around September 28. That gives Lebanon an average growing season of about 140 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 11 |
| Late (90%) | May 27 |
First fall frost
| Early (10%) | September 17 |
|---|---|
| Average (50%) | September 28 |
| Late (90% chance before) | October 11 |