Frost line depth in Dolores County, CO
How deep the ground freezes in Dolores County, CO
25 in. Dig to 25 in, just below the frost. Nearest NOAA station: Yellow Jacket 4ne, 14.8 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.