06/10/2026
Helping Hedgehogs Prepare for Hibernation: A Complete Guide for Autumn
As autumn settles in and temperatures begin to drop, hedgehogs across the UK start preparing for one of the most challenging periods of their year — hibernation. This natural process helps them survive the winter when food is scarce, but modern gardens, unpredictable weather, and human activity can make it harder for hedgehogs to get ready. With a few simple actions, you can make a real difference to their survival.
Understanding Hibernation: What Hedgehogs Need to Survive Winter
Hibernation is a controlled shutdown of the hedgehog’s body. Their heart rate slows, their temperature drops, and they rely entirely on stored fat to keep them alive. Because of this, entering hibernation at a healthy weight is absolutely essential.
Most adult hedgehogs manage this well, but juveniles born late in the year — known as autumn juveniles — often struggle. These youngsters need extra support to reach a safe weight before winter arrives.
Feeding Hedgehogs in Autumn: Why It Matters
Why Leave Food Out?
Natural food sources decline sharply in autumn. By offering supplementary food, you help hedgehogs build the fat reserves they need to survive hibernation.
What to Feed
The best foods are:
Wet cat food
Dry cat biscuits
Specialist hedgehog food (only reputable brands)
Avoid:
Mealworms
Sunflower hearts
Peanuts
Bread or milk
These items can cause metabolic issues, calcium imbalance, or digestive upset.
How Often to Feed
Place food out every evening, ideally in a feeding station (a box with a small entrance) to keep cats away. Fresh water should be available at all times.
Juveniles: Helping Autumn Hoglets Put on Weight
Young hedgehogs born late in the season often appear small and underweight. Many people mistakenly assume they are “too small to hibernate” and take them from the wild — but this is rarely necessary.
A juvenile hedgehog should weigh at least 450–500g by the time night temperatures consistently fall below 5°C. Until then, they have plenty of time to forage and grow.
When to Intervene
A juvenile should only be rescued if:
It is out during the day
It appears injured, wobbly, cold, or lethargic
It is clearly underweight (e.g., tiny, thin, or visibly struggling)
Night temperatures have dropped below 5°C for a week or frost has arrived
Otherwise, leave them in the wild, provide food, and allow them to continue building weight naturally.
Nesting and Hibernaculum Building: Creating Safe Winter Shelter
Hedgehogs build a winter nest called a hibernaculum — a tightly packed, waterproof structure made from leaves, grass, moss, and natural debris. A good hibernaculum keeps them insulated and dry throughout the winter.
How You Can Help Hedgehogs Build Nests
Leave leaf piles undisturbed. These are prime nesting materials.
Avoid tidying the garden too much. Wild corners are perfect for hedgehogs.
Provide nesting materials:
Dry leaves
Long grass
Moss
Straw
Put out a hedgehog house. Place it in a quiet, sheltered spot and fill it loosely with natural materials.
Never move or disturb a nest. A hedgehog may abandon it if disrupted.
Garden Changes That Make a Big Difference
Small adjustments can dramatically improve a hedgehog’s chance of surviving winter:
Create hedgehog highways — 13cm x 13cm gaps in fences to allow safe movement between gardens.
Avoid using pesticides and slug pellets. These reduce natural food sources and can poison hedgehogs.
Check compost heaps and log piles before disturbing them — hedgehogs often nest inside.
Be cautious with bonfires. Always rebuild them on the day of lighting to prevent hedgehogs nesting inside.
When Do Hedgehogs Actually Hibernate?
Hedgehogs don’t hibernate on a fixed date. They wait for:
Night temperatures consistently below 5°C,
Food scarcity,
A secure, completed hibernaculum.
Some hedgehogs may hibernate as early as late October; others may remain active into December. Juveniles often stay active longer while they continue to gain weight.
A Final Thought
Helping hedgehogs prepare for hibernation is one of the most impactful things you can do for wildlife in your garden. By offering food, providing nesting materials, and creating a safe environment, you support both adults and vulnerable juveniles through the toughest season of their year.
Your garden could be the difference between a hedgehog surviving winter or not — and that’s a powerful thing.
