Good choice not to release it as it is not native and someone
already has the first go-around. Make sure that if you keep
it outside that it has plenty of shade to get out of the sun
otherwise it could quickly overheat.

I have been a turtle owner for many years and would not
attempt a natural hibernation. Only those that are experienced
should really do this. I would take the first posters advice
and move it inside in the winter time.

I bring my five in when the night time temp regularly drops
below 55 degrees.

Hope this helps
Linda