Frost dates in Williamsport, MD
The average last spring frost in Williamsport is around April 12 and the first fall frost is around October 29. That gives Williamsport an average growing season of about 200 days.
Last spring frost
| Early (10% chance after) | March 29 |
|---|---|
| Average (50%) | April 12 |
| Late (90%) | April 21 |
First fall frost
| Early (10%) | October 15 |
|---|---|
| Average (50%) | October 29 |
| Late (90% chance before) | November 28 |