Frost line depth in Potter County, PA
How deep the ground freezes in Potter County, PA
40 in. Dig to 40 in, just below the frost. Nearest NOAA station: Coudersport 7se, 4 mi.
Your building department sets the legal frost line depth (IRC Table R301.2(1)); footings must go below it (R403.1.4.1). Call them before you dig.