[CherryBrandy]

I have 14 Horsfields and they hibernate same as Sandy's in a greenhouse, but in shingle. They just stop eating, sleep more and then bury down when they want. Usually all at the same time and they pop up all on the same day. Clocks go back, tortoises wind down, up in March, sometimes earlier. I weigh prior and check weekly. One of my Spurs though is whizzing around in the rain because it is so warm. She isn't eating. That needs monitoring because the combination of cold and wet is lethal. You could try a mini pop up plastic greenhouse (very cheap on net) over the top when you know he is buried til Spring.