Well as you said you live in Mass, and i do not think you will be finding any snakes this time of year because your temperatures are below freezing and you have already had snow so most lilely all snakes are hibernating.
You may get lucky and find a Eastern Garter, but i dont believe you will be finding anything else. Maybe im wrong, hopefully i am because i know how it is not to be able to go look for snakes when its the winter because of the temperature.
When i lived in Mass i lived in Lowell and i would always go to the Dracut/Lowell state forest and go herping and i did all year round and never found anything in the winter except the rare Garter snake. In spring time even with the lower temperatures is a good time to start looking because its breeding time for all snakes and you would have better chances of find them.

-----
Cameron