Frost dates in St. Charles, MO
The average last spring frost in St. Charles is around April 12 and the first fall frost is around October 25. That gives St. Charles an average growing season of about 196 days.
Last spring frost
| Early (10% chance after) | March 28 |
|---|---|
| Average (50%) | April 12 |
| Late (90%) | April 26 |
First fall frost
| Early (10%) | October 7 |
|---|---|
| Average (50%) | October 25 |
| Late (90% chance before) | November 8 |