Frost line depth in Cuming County, NE
How deep the ground freezes in Cuming County, NE
39 in. Dig to 39 in, just below the frost. Nearest NOAA station: W Pt, 6.2 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.