He would dig in and hibernate himself. If he is not 100% healthy or his choice of hibernation spot was too cold or too wet or at risk from predators like rats, then no he would not survive. Don't get me wrong, some torts do hibernate themselves successfully in people's back yards, but it is not something that I would recommend.Would he live through the winter? Would he make it? That's what I'm going for I guess.
I think I'll just give him a house saving it from the snow and hail and try my chances. I feel like the hardy nature will adapt and overcome.