Frost dates in Butler, PA
The average last spring frost in Butler is around May 11 and the first fall frost is around October 11. That gives Butler an average growing season of about 153 days.
Last spring frost
| Early (10% chance after) | April 28 |
|---|---|
| Average (50%) | May 11 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 26 |
|---|---|
| Average (50%) | October 11 |
| Late (90% chance before) | October 24 |