Frost line depth in Stevens County, MN
How deep the ground freezes in Stevens County, MN
60 in. Dig to 61 in, just below the frost. Nearest NOAA station: Morris W Cntrl Rsch & Outreach, 5.7 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.