Frost line depth in Tioga County, PA
How deep the ground freezes in Tioga County, PA
39 in. Dig to 39 in, just below the frost. Nearest NOAA station: Wellsboro 4 Sw, 8.1 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.