Frost line depth in Vilas County, WI
How deep the ground freezes in Vilas County, WI
63 in. Dig to 64 in, just below the frost. Nearest NOAA station: St Germain, 9.3 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.