Frost line depth in Columbiana County, OH
How deep the ground freezes in Columbiana County, OH
28 in. Dig to 29 in, just below the frost. Nearest NOAA station: Millport 4 Ne, 4.1 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.