Frost line depth in Rock County, WI

How deep the ground freezes in Rock County, WI

40 in. Dig to 40 in, just below the frost. Nearest NOAA station: Afton - Janesville Wwtp, 2.3 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.

Code depth · Snow