Frost line depth in Adams County, WI
How deep the ground freezes in Adams County, WI
48 in. Dig to 48 in, just below the frost. Nearest NOAA station: Friendship, 3.2 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.