The time when hedgehogs start to hibernate is very dependent on the prevailing weather conditions . They start to hibernate when the temperature in the immediate surroundings becomes and remains relatively low. In Britain, this is usually during November, December or even January. There also appears to be an internal readiness that brings about certain physiological changes.
Towards the end of autumn, hedgehogs consider the best places to build nests (called hibernacula). Favourite sites are under hedges and roots of trees, in piles of brushwood, inside compost heaps or in old rabbit burrows and underneath timber buildings and sheds. The nest itself is ramshackle in appearance but well constructed from old dry leaves, grass and other vegetation and can be up to 50 centimetres (20 inches) thick.
If you would like to build your own hedgehog home, or just want more information about hedgehogs, please visit the British Hedgehog Preservation Society website.