If you need to shop for groceries on Thanksgiving, there are several places that will be open. Here is a roundup of hours, based on contacting local grocery stores:
A&P (Mount Kisco): 7 a.m. to 8 p.m.
A&P (Millwood): 7 a.m. to 6 p.m.
Shop Rite (Bedford Hills): 6 a.m. to 4 p.m.