Originally Posted by Karl_Mcknight

Don't release him into the cold right now. He came into your house to get warm.

I think it's a Garter Snake. I can assure you whatever it is, it's not a rattle snake or any type of venomous snake.

If you have a zoo or animal rescue somewhere in your area, they may take him off your hands. Otherwise, don't release him until the temps get up around 58 degrees or higher. If it is a Garter snake, they typically enjoy cooler temps than most of the other snakes, and will even take a swim to cool off.

You could try feeding earthworms, small feeder fish, and small frogs, as they eat those in the wild.

Good luck with the little fella, I hope he makes it through the winter.