Frost line depth in Essex County, NY
How deep the ground freezes in Essex County, NY
55 in. Dig to 56 in, just below the frost. Nearest NOAA station: Lake Placid 2 S, 16.9 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.