Frost dates in Sullivan, IN
The average last spring frost in Sullivan is around April 16 and the first fall frost is around October 19. That gives Sullivan an average growing season of about 186 days.
Last spring frost
| Early (10% chance after) | April 5 |
|---|---|
| Average (50%) | April 16 |
| Late (90%) | May 3 |
First fall frost
| Early (10%) | October 7 |
|---|---|
| Average (50%) | October 19 |
| Late (90% chance before) | October 31 |