Frost dates in St. Ann, MO
The average last spring frost in St. Ann is around April 6 and the first fall frost is around November 1. That gives St. Ann an average growing season of about 209 days.
Last spring frost
| Early (10% chance after) | March 24 |
|---|---|
| Average (50%) | April 6 |
| Late (90%) | April 19 |
First fall frost
| Early (10%) | October 17 |
|---|---|
| Average (50%) | November 1 |
| Late (90% chance before) | November 13 |