Frost dates in Ontario, OH
The average last spring frost in Ontario is around May 6 and the first fall frost is around October 5. That gives Ontario an average growing season of about 152 days.
Last spring frost
| Early (10% chance after) | April 24 |
|---|---|
| Average (50%) | May 6 |
| Late (90%) | May 25 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | October 5 |
| Late (90% chance before) | October 24 |