frogza

Because of the winter temps you will want a tortoise that hibernates. Avoid tropical species like red foot, yellow foot, hingebacks, leopard etc. Perhaps a russian tortoise would be a good one. They stay small and naturally hibernate about 6 months a year. Which will help it make it through the winter. Another good option may be a mediterranean spur thighed tortoise, it doesn't hibernate but can live comfortably indoors year round in a relatively small inclosure.

Good luck with your choice!