Frost line depth in Sawyer County, WI
How deep the ground freezes in Sawyer County, WI
60 in. Dig to 60 in, just below the frost. Nearest NOAA station: Winter, 8.6 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.