Frost dates in Portsmouth, OH
The average last spring frost in Portsmouth is around April 16 and the first fall frost is around October 22. That gives Portsmouth an average growing season of about 189 days.
Last spring frost
| Early (10% chance after) | April 5 |
|---|---|
| Average (50%) | April 16 |
| Late (90%) | May 5 |
First fall frost
| Early (10%) | October 3 |
|---|---|
| Average (50%) | October 22 |
| Late (90% chance before) | November 4 |