Frost line depth in Butler County, OH
How deep the ground freezes in Butler County, OH
21 in. Dig to 22 in, just below the frost. Nearest NOAA station: Hamilton Butler Co Rgnl Ap, 5.6 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.