Frost line depth in Conejos County, CO
How deep the ground freezes in Conejos County, CO
41 in. Dig to 41 in, just below the frost. Nearest NOAA station: Manassa, 13.3 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.