Frost line depth in Kings County, NY
How deep the ground freezes in Kings County, NY
16 in. Dig to 16 in, just below the frost. Nearest NOAA station: Ny Ave V Brooklyn, 3.3 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.