In the UK, wild hedgehogs usually hibernate from October or November until March or April. These are approximate months, not fixed start and finish dates. Weather, food availability and the individual animal affect the timing, and a hedgehog may wake or change nests during winter.
Found a hedgehog that may need help? A cold, still hedgehog exposed in the open, or one that is injured or unsteady, needs urgent advice. See when to seek help and what to do next.
This guide concerns wild European hedgehogs in the UK. Seasonal dates differ elsewhere, and this is not a hibernation guide for pet hedgehogs.
Lead photograph: European hedgehog in the Netherlands by Hrald, edited by Papa Lima Whiskey, Wikimedia Commons, CC BY-SA 3.0.
2.jpg){kind=link}
When does hibernation start and finish?
Hedgehog Street’s hibernation overview gives October/November to March/April as the usual season. Mild conditions can keep hedgehogs active into November and December. An active animal is not automatically in trouble simply because winter has begun.
“Hedgehogs usually hibernate from October/November through to March/April.”
Approximate period | What you may notice |
|---|---|
Autumn | Feeding and nest preparation; some hedgehogs begin hibernating in October or November. |
Winter | Long absences, with occasional activity or a move between nests. |
March–April | Spring activity commonly resumes, depending on local conditions. |
Use this calendar to plan garden work, not to diagnose an animal. Note when and where you see it, whether it is moving normally and whether it is exposed or sheltered. Those observations are more useful to a rescuer than the month alone.
How long do they hibernate?
The usual UK dates span roughly four to six months, but this is a seasonal guide rather than a continuous sleep. Individual hedgehogs may start later, emerge earlier or wake during that period.
Why do hedgehogs hibernate?
Hibernation conserves energy when food is scarce. A hedgehog enters a state called torpor: body temperature and other bodily processes slow, and stored fat supplies energy. It is more than an ordinary long sleep.
There is no single garden-thermometer reading that tells you every hedgehog should be hibernating. Do not try to trigger hibernation by withholding food or moving an animal to a colder place.
Where do hedgehogs spend the winter?
They use sheltered nests, which may be beneath shrubs or sheds, among logs and leaves, or inside a suitable hedgehog house. Leave occupied sites alone. Do not add bedding, lift the lid or move a house simply to check its resident.
Prepare shelter before it is occupied: retain leaves and quiet planted corners, and position any house somewhere dry and sheltered. Keep feeding areas separate from sleeping places. Our guide to making a garden welcoming to hedgehogs covers access, shelter and feeding-station setup.
Is it normal for a hedgehog to wake in winter?
Yes. Hibernation is interrupted by waking periods, and some hedgehogs leave to forage or move nest. A purposeful night-time visitor in mild weather may therefore be behaving normally. Avoid handling it just to check whether it should be asleep.
Hedgehog Street’s hibernation FAQs explain winter activity, nesting and feeding. A winter sighting still needs attention if the animal looks unwell: the distinction is its condition and circumstances, not simply whether it is awake.
Should you keep putting food out?
Offer supplementary food during mild spells or when hedgehogs are active. Suitable choices include meaty cat or dog food and cat biscuits, with fresh water. Check dishes daily, remove leftovers and keep the feeding area clean. Do not leave stale food out for weeks waiting for a visitor.
An empty food bowl alone does not identify which animal visited. Watch from a distance for signs of activity.
When does a winter hedgehog need help?
What you find | What to do |
|---|---|
An active, apparently well hedgehog at night | Observe from a distance and offer food and water. Seek advice if its condition concerns you. |
An undisturbed hedgehog inside an intact nest | Leave the nest and surrounding cover alone. |
A cold, curled-up hedgehog exposed on the lawn or path | Seek urgent rescue advice; do not assume normal hibernation. |
An animal staggering, injured, lethargic or with flies around it | Contact a hedgehog rescue or vet promptly. |
Daytime activity in autumn or winter warrants prompt advice too. Do not dismiss it as harmless because the hedgehog can still walk.
Is it hibernating or dead?
Very slow breathing can be difficult to see. Do not declare an animal dead just because it is cold and still, or uncover an intact nest to perform a test. If it is exposed, injured or you are uncertain about a hedgehog you have found, contact an experienced rehabilitator or vet.
Does a hedgehog have to weigh 600 g?
No single weight guarantees survival, and 600 g is not a universal rescue cut-off. Health, weather and circumstances matter. The BHPS autumn-juvenile guidance says animals below 450 g from late October may need help, depending on the circumstances; it discourages rescue above 450 g based on weight alone.
Ask a rehabilitator how to assess a small visitor. Do not repeatedly catch healthy-looking animals or disturb nests to weigh them, and do not wait for a weight check before seeking help for an obviously unwell hedgehog.
What should you do while arranging help?
Call the British Hedgehog Preservation Society on 01584 890 801 for advice and local rescue contacts. Follow its hedgehog first-aid instructions for an animal that needs rescuing.
Outside office hours, if you have a hedgehog needing help, select option 1 on the BHPS answerphone for emergency contact numbers. If a volunteer cannot answer, try another listed number. An animal in obvious pain or needing urgent treatment should go to a local vet immediately.
Using gloves or a folded towel, place it in a high-sided box with a towel or fleece and keep it somewhere quiet indoors. A wrapped warm-water bottle can provide gentle warmth, with room for the hedgehog to move away; keep it warm rather than allowing it to cool. Ask for guidance if unsure about heating. Offer water and meaty pet food, and arrange expert care promptly. Obvious severe injury or pain needs a vet urgently.
Should you keep a hibernating hedgehog warm?
No. A healthy hedgehog hibernating safely in its nest does not need artificial heating or to be brought indoors. Its body temperature falls during hibernation to conserve energy. The gentle warmth described above is temporary first aid for a hedgehog that needs rescuing.
What if you accidentally disturb a hibernating hedgehog?
Stop work, gently replace the covering material and leave it undisturbed to rouse naturally. Keep people and pets away. Do not relocate it as a routine precaution. If the nest is damaged, the site cannot be kept safe or the animal appears injured, call a rescue for advice before continuing.
A practical winter routine is to mark the area in your garden-work plan, tell anyone else maintaining the garden, and postpone work around an occupied nest. This helps prevent a second disturbance after the first one.
How can you help when hedgehogs emerge in spring?
Keep clean water and suitable food available for active visitors, and retain their routes through the garden. If an emerging hedgehog is weak or unsteady, seek advice rather than assuming it will recover with a meal.
Related reading: What Does a Hedgehog Nest Look Like? UK Guide.
Sources & further reading
Guidance checked on 23 September 2026. Sources linked in the article: Hedgehog Street (PTES and BHPS), Hedgehog hibernation (undated) and Hibernation FAQs (11 November 2019); British Hedgehog Preservation Society, Autumn Juveniles and Hedgehog First Aid Advice (undated). Timing is approximate; individual welfare decisions should be made with a wildlife rehabilitator or vet.