I'm not an expert by any means, but until someone else comes along, I would say hibernation outside in just a garden enclosure is definitely not an option. He/She needs to be healthy and at a decent weight to survive, would need a proper wind down period and to be hibernated in a fridge kept at 5 degrees. There is a lot of info on the site if you search hibernation. I would personally get the tortoise up and quickly set up your indoor enclosure and give warm baths to make sure He/She is not dehydrated . Not sure where you live but it has been far too cold up here in the north east to leave a tortoise outside especially overnight.
Hope that helps,
Wendy
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