Frost line depth in Brown County, NE
How deep the ground freezes in Brown County, NE
29 in. Dig to 29 in, just below the frost. Nearest NOAA station: Elsmere 9 Ene, 13.7 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.