Frost line depth in Dutchess County, NY
How deep the ground freezes in Dutchess County, NY
30 in. Dig to 30 in, just below the frost. Nearest NOAA station: Millbrook 3 W, 2.1 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.