Frost line depth in Ontario County, NY
How deep the ground freezes in Ontario County, NY
32 in. Dig to 32 in, just below the frost. Nearest NOAA station: Canandaigua 3 S, 1.4 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.