Frost dates in St. Mary, MO
The average last spring frost in St. Mary is around April 7 and the first fall frost is around November 2. That gives St. Mary an average growing season of about 209 days.
Last spring frost
| Early (10% chance after) | March 1 |
|---|---|
| Average (50%) | April 7 |
| Late (90%) | April 17 |
First fall frost
| Early (10%) | October 29 |
|---|---|
| Average (50%) | November 2 |
| Late (90% chance before) | November 22 |