Frost dates in Allentown, PA
The average last spring frost in Allentown is around April 22 and the first fall frost is around October 18. That gives Allentown an average growing season of about 179 days.
Last spring frost
| Early (10% chance after) | April 9 |
|---|---|
| Average (50%) | April 22 |
| Late (90%) | May 11 |
First fall frost
| Early (10%) | October 7 |
|---|---|
| Average (50%) | October 18 |
| Late (90% chance before) | November 2 |