Frost dates in Thomson, IL
The average last spring frost in Thomson is around April 15 and the first fall frost is around October 22. That gives Thomson an average growing season of about 190 days.
Last spring frost
| Early (10% chance after) | April 4 |
|---|---|
| Average (50%) | April 15 |
| Late (90%) | April 29 |
First fall frost
| Early (10%) | October 6 |
|---|---|
| Average (50%) | October 22 |
| Late (90% chance before) | November 5 |