Wild Hedgehog Hibernation Welfare

Hedgehog hibernation is a physiologically complex process that can go wrong in several ways, particularly in garden and suburban habitats where conditions may not be optimal. Understanding hibernation biology helps people support hedgehogs through this critical period.

Key Facts

Hedgehogs in the UK typically hibernate from November to March, though timing varies with temperature and body condition
A pre-hibernation weight of at least 450-600 grams is considered necessary for successful winter survival
Late-born juveniles from second litters are at highest risk of failing to reach sufficient weight before winter
Hedgehogs do not sleep continuously in hibernation but arouse periodically, which uses stored fat reserves
Sudden temperature fluctuations can cause premature arousal, depleting critical fat reserves
Garden bonfires pose a serious mortality risk to hedgehogs seeking hibernation sites in leaf piles
Providing supplementary food (wet cat food or hedgehog food) in autumn helps underweight juveniles
Hedgehog houses provide secure hibernation sites protected from disturbance and extreme temperature

Welfare Considerations

Failed hibernation is a leading cause of hedgehog mortality and causes genuine suffering through starvation and exposure. Late-season juveniles face a particularly challenging situation, needing to gain enough weight in a short window while temperatures drop. Human activities - bonfire building, removing leaf piles, garden tidying - can destroy hibernation sites. Simple interventions including supplementary feeding in autumn and providing undisturbed corners of garden can significantly improve survival.

What You Can Do

Check bonfires for hedgehogs before lighting, especially in autumn and early winter
Leave undisturbed areas of your garden with leaf piles or log stacks for hibernation
Provide supplementary food (meat-based wet cat food) from September to November for underweight juveniles
Install a hedgehog house in a quiet, sheltered corner of your garden