depends on age,i personally don't hibernate any tortoise under 3yrs of age,I've got a indoor table top tortoise enclosure for the winter months,its also of a lot of benefit to build a outdoor tortoise house,this helps them get away from the elements when they please,I've been told its ok to just put them outside & leave them to it, but I've learnt this can be a little miss leading for many reasons,best advice is to read & study all you can as opinions can very