Frost dates in Grand Tower, IL
The average last spring frost in Grand Tower is around April 5 and the first fall frost is around October 30. That gives Grand Tower an average growing season of about 208 days.
Last spring frost
| Early (10% chance after) | March 24 |
|---|---|
| Average (50%) | April 5 |
| Late (90%) | April 12 |
First fall frost
| Early (10%) | October 21 |
|---|---|
| Average (50%) | October 30 |
| Late (90% chance before) | November 13 |