Frost dates in Union, MO
The average last spring frost in Union is around April 20 and the first fall frost is around October 11. That gives Union an average growing season of about 174 days.
Last spring frost
| Early (10% chance after) | April 7 |
|---|---|
| Average (50%) | April 20 |
| Late (90%) | May 7 |
First fall frost
| Early (10%) | September 30 |
|---|---|
| Average (50%) | October 11 |
| Late (90% chance before) | October 29 |