Frost line depth in Bayfield County, WI
How deep the ground freezes in Bayfield County, WI
55 in. Dig to 55 in, just below the frost. Nearest NOAA station: Ashland Kennedy Mem Ap, 13.6 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.