In the UK, hedgehogs typically start hibernating in late December, although this depends on the weather. Hibernation can begin earlier if temperatures drop a lot, and they may emerge later if the cold weather continues into the spring. During this time, they will use the fat stores they built up by eating as much as they can over the summer.
Don’t worry if you see a hedgehog out of hibernation in the winter months, they may move to a more suitable site. If you happen to see one curled up in an open space, it is recommended that you move it to a warm, damp-free area safe from any predators.
Hedgehogs hibernate by making themselves still, this allows their bodies to cool which results in their heart rate and body temperature dropping. Hedgehogs become mostly still due to the cold, if it becomes milder, they may venture out to have some food or water before returning to their nest to sleep.

Hedgehogs hibernate for many reasons:
Hedgehogs hibernate in many locations where they can stay safe, dry, and away from the cold.
Hibernation sites for hedgehogs include:

Provide a safe spot:
A hedgehog-friendly garden:
Check for safety hazards:
Hedgehogs eat a range of pests such as snails and slugs, which can help the health of plants in your garden.
If you accidentally disturb a hibernating hedgehog, immediately cover it up with leaves for warmth, and leave out some food and water in case it wakes up, this will give it enough energy to relocate and build a new nest.

When moving a hedgehog, gloves must be worn to protect yourself from the hedgehog’s spikes. Approach calmly, and gently scoop the hedgehog from below using both hands to support its body. Once you have the hedgehog in your hands, hold it gently but securely. Stay quiet and calm to avoid the hedgehog getting frightened.

