🐿️Do Squirrels Hibernate? How They Survive Winter
Do Squirrels Hibernate?
Quick Answer
Most squirrels do not truly hibernate. Tree squirrels such as gray, red, and fox squirrels remain active throughout winter, although they may spend more time inside their nests during very cold or stormy weather. Some ground squirrels, however, are true hibernators and can spend several months in underground burrows.
So, the answer depends on which kind of squirrel you are talking about.
Read 🐿️Do Squirrels See People?
Quick Answer Table
| Squirrel type | Do they hibernate? | What happens in winter? |
|---|---|---|
| Tree squirrels | ❌ Usually no | Stay active, eat stored food and shelter in nests |
| Gray squirrels | ❌ No true hibernation | Remain active throughout winter |
| Red squirrels | ❌ No true hibernation | Stay active and rely on stored food |
| Fox squirrels | ❌ No true hibernation | Remain active and use nests or tree cavities |
| Ground squirrels | ✅ Many species do | Enter true hibernation in underground burrows |
The important point: squirrels are not all the same. The squirrels you commonly see running around trees are generally not true hibernators, while several ground-dwelling squirrel species are. Explore 🐿️Are Squirrels Omnivores?
What Is Hibernation?
Hibernation is a prolonged period of greatly reduced activity in which an animal lowers its body temperature, slows its heart rate and breathing, and reduces its energy use.
Animals use hibernation to survive periods when food is scarce or environmental conditions are difficult.
This is different from simply sleeping more or staying inside a warm nest.
That distinction is important when talking about squirrels. Read 🐰 Are Bunnies Rodents?
Do Tree Squirrels Hibernate?
No, most tree squirrels do not truly hibernate.
Gray squirrels, red squirrels, and fox squirrels generally remain active throughout the winter.
Instead of shutting down their bodies for months, they use several strategies to survive cold weather.
1. They store food
Squirrels collect nuts, seeds, and other foods when food is plentiful.
Many tree squirrels bury food in separate locations. This behavior is called scatter hoarding.
When winter arrives, squirrels can search for some of these hidden food stores.
2. They build sheltered nests
Tree squirrels make nests, often called dreys, from leaves, twigs, bark and other materials.
These nests provide shelter from wind, rain and cold temperatures.
Some squirrels also use natural cavities in trees.
3. They grow thicker fur
Many squirrels use a combination of food storage, shelter, body-energy reserves and changes in activity to cope with winter.
4. They reduce activity during bad weather
A squirrel may remain inside its nest or shelter during particularly cold, windy or wet weather.
This does not necessarily mean it is hibernating.
The squirrel can become active again when conditions improve.
Do Ground Squirrels Hibernate?
Yes, many ground squirrels are true hibernators.
Ground squirrels spend much of their lives on or underground rather than living primarily in trees.
Before winter, some species prepare by eating heavily and storing energy.
When hibernation begins, their metabolism drops dramatically. Their body temperature, heart rate and breathing can fall to very low levels.
They may remain underground for an extended period before becoming active again.
This is why saying “squirrels never hibernate” is misleading.
Some squirrels absolutely do.
Tree Squirrels vs Ground Squirrels
The easiest way to understand the difference is to compare their winter strategies.
| Feature | Tree squirrels | Ground squirrels |
|---|---|---|
| Main habitat | Trees | Ground and underground burrows |
| True hibernation | Usually no | Many species do |
| Winter activity | Generally remain active | Often become inactive for months |
| Food strategy | Store and search for food | Build energy reserves and prepare for hibernation |
| Winter shelter | Tree nests or cavities | Underground burrows |
| Body temperature during hibernation | No prolonged hibernation | Can drop dramatically |
In simple terms: tree squirrels usually prepare for winter and stay active, while many ground squirrels prepare for winter and hibernate.
Do Squirrels Come Out in Winter?
Yes. Tree squirrels can come out during winter.
Seeing a squirrel running across the ground or climbing a tree on a cold winter morning does not mean something is unusual.
Tree squirrels need to find food throughout the year.
However, their activity may change with the weather.
During freezing temperatures, heavy rain, strong winds or snow, they may remain sheltered for longer periods.
Once conditions improve, they can leave their nests and search for food.
Where Do Squirrels Sleep in Winter?
Tree squirrels usually sleep in nests or tree cavities.
A squirrel's nest can provide protection from cold wind and precipitation.
Some squirrels may also share shelter with other squirrels, particularly during very cold conditions.
Their winter shelter is therefore an important part of their survival strategy.
Do Squirrels Sleep More in Winter?
Squirrels may spend more time resting or sheltering during unfavorable winter weather, but this is not the same as hibernation.
A hibernating animal undergoes major physiological changes that conserve energy.
A tree squirrel can simply remain inside its nest for a period and later wake up, leave the shelter and search for food.
How Do Squirrels Survive Winter Without Hibernating?
Tree squirrels have several advantages that help them survive cold weather.
Their winter survival strategy includes:
🥜 Storing food
🪹 Building insulated nests
🌳 Using tree cavities for shelter
🧥 Growing thicker fur
🔋 Maintaining energy reserves
🌧️ Staying sheltered during severe weather
🔎 Returning to hidden food caches
Instead of spending the entire winter asleep, they prepare for winter and continue living through it.
Do Red Squirrels Hibernate?
No, red squirrels generally do not truly hibernate.
They remain active during winter and depend heavily on food they have stored or can find.
They may spend more time sheltered when weather conditions are severe, but this should not be confused with true hibernation.
A Simple Family Example
Imagine a family sitting near a park on a cold winter morning.
Their child sees a squirrel running across a tree branch and asks:
“Dad, I thought squirrels sleep all winter. Why is this one running around?”
The answer is that the squirrel is probably a tree squirrel, and tree squirrels generally do not hibernate.
Instead, the squirrel may have spent autumn preparing for winter by gathering food and finding safe places to shelter. During cold or stormy weather, it can spend more time inside its nest or tree cavity. When the weather improves, it comes back out to search for food.
Now imagine a different squirrel living in an underground burrow. Some ground squirrels really do hibernate. They build up energy reserves before winter and can remain underground for months.
So when someone asks, “Do squirrels hibernate?”, the best answer isn't simply yes or no.
It depends on the type of squirrel.
At What Temperature Do Squirrels Hibernate?
There is no single temperature at which all squirrels suddenly begin hibernating.
This question can be confusing because different squirrel species have very different winter strategies.
Most tree squirrels do not enter true hibernation even when temperatures become very cold.
Instead, they can reduce activity and remain sheltered during unfavorable conditions.
Ground squirrels that hibernate follow species-specific seasonal and physiological patterns.
How Long Do Squirrels Hibernate?
For squirrels that truly hibernate, the duration varies by species, location and environmental conditions.
Some ground squirrels can remain underground for several months.
Tree squirrels generally do not spend the winter in a continuous hibernation state. They continue to wake, move around and search for food.
Why Don't Tree Squirrels Hibernate?
Tree squirrels have evolved a different way of dealing with winter.
Rather than entering prolonged hibernation, they can survive by storing food and using sheltered nests.
Their food caches are particularly useful because winter can make naturally available food harder to find.
This strategy allows them to remain active even when temperatures are low.
What Happens to Squirrels During Very Cold Weather?
When weather becomes particularly harsh, tree squirrels may become much less visible.
They can spend longer periods inside nests or tree cavities to conserve energy and stay protected from the elements.
Once conditions become more favorable, they can return to normal activity.
So if you don't see squirrels for a few days during severe weather, they haven't necessarily disappeared.
They may simply be keeping a low profile.
Interesting Squirrel Facts
🟤 Not every squirrel hibernates. Different squirrel species have very different winter strategies.
🟤 Many tree squirrels remain active during winter.
🟤 Ground squirrels include several true hibernating species.
🟤 Squirrels can hide food in numerous locations.
🟤 A squirrel staying inside its nest during cold weather is not necessarily hibernating.
🟤 Winter survival is largely about energy conservation, food availability and shelter.
Tree Squirrel or Ground Squirrel: Which One Do You See?
One easy clue is where you normally see the animal.
If you regularly see a squirrel climbing trees, jumping between branches and feeding in trees, it is likely a tree squirrel.
Ground squirrels spend much more of their time on the ground and often use burrows.
However, identifying a squirrel accurately requires looking at its physical characteristics and local species.
Quick Summary
Do squirrels hibernate?
Most tree squirrels do not.
They survive winter by storing food, using sheltered nests, growing thicker coats and adjusting their activity during severe weather.
Many ground squirrels are different. They are true hibernators and can spend several months underground.
So the most accurate answer is:
Most tree squirrels don't hibernate, but some ground squirrels do.
🧠 MFJ Nature Insight: Two Ways to Beat Winter
Squirrels have more than one way to deal with winter.
🌳 Tree squirrel strategy
Prepare → Store food → Shelter → Stay active
Tree squirrels generally remain active during winter. They can store food, use nests or tree cavities for shelter, and reduce their activity during harsh weather.
🕳️ Ground squirrel strategy
Eat more → Build energy reserves → Hibernate → Emerge in spring
Many ground squirrels take a completely different approach. They build up energy reserves and spend a long period underground in hibernation.
The big idea
Same squirrel family. Very different winter strategies.
That's why saying “squirrels don't hibernate” is too broad.
🧐 Hibernation vs. Staying in a Nest
A squirrel hiding inside its nest during cold weather does not automatically mean it is hibernating.
| Hibernation | Winter shelter |
|---|---|
| Major physiological slowdown | Mainly behavioral sheltering |
| Body temperature can fall dramatically | Normal body functions continue |
| Heart rate and breathing can slow greatly | No prolonged hibernation state |
| Can last for months in some species | May last hours or days depending on weather |
| Common in many ground squirrels | Common winter behavior of tree squirrels |
Think of it this way:
A tree squirrel taking a cold-weather day off is not the same thing as a ground squirrel spending the winter underground.
That difference is one of the easiest ways to understand squirrel winter behavior.
🔎 MFJ Field Observation: Where Does the Squirrel Live?
If you're trying to understand whether a squirrel is likely to hibernate, don't just look at the animal.
Look at where it lives.
🌳 Mostly in trees?
You may be looking at a tree squirrel. Many tree squirrels remain active throughout winter.
🕳️ Mostly in underground burrows?
It may be a ground squirrel. Several ground squirrel species are true hibernators.
This isn't a foolproof identification method because squirrel species vary, but habitat gives you an important clue.
Nature often gives you the answer before you even know the species name.
Quick Quiz
1. Do most tree squirrels truly hibernate?
A. Yes
B. No
C. Only at night
Answer: B. No
2. Which squirrels include many true hibernators?
A. Ground squirrels
B. Tree squirrels
C. Flying birds
Answer: A. Ground squirrels
3. What do tree squirrels often do to prepare for winter?
A. Migrate
B. Store food
C. Stop eating
Answer: B. Store food
4. Where can tree squirrels shelter during severe winter weather?
A. Tree nests and cavities
B. Open fields
C. Rivers
Answer: A. Tree nests and cavities
Frequently Asked Questions
Do squirrels hibernate?
Most tree squirrels do not truly hibernate. They remain active throughout winter and survive by storing food and using sheltered nests. Many ground squirrels, however, do hibernate.
Do red squirrels hibernate?
No. Red squirrels generally remain active during winter rather than entering prolonged true hibernation.
Do squirrels come out in winter?
Yes. Tree squirrels can remain active during winter, although they may stay inside their nests for longer during severe weather.
Where do squirrels go in winter?
Tree squirrels usually shelter in nests, tree cavities or other protected locations. Ground squirrels that hibernate spend the winter underground.
Do squirrels sleep all winter?
No. Most tree squirrels do not sleep continuously throughout winter. They wake, move around and search for food.
At what temperature do squirrels hibernate?
There is no single temperature that causes all squirrels to hibernate. Most tree squirrels do not truly hibernate, while hibernating ground squirrels follow species-specific seasonal patterns.
How do squirrels survive winter without hibernating?
They store food, use insulated nests or tree cavities, grow thicker fur, maintain energy reserves and reduce activity during severe weather.
Do all squirrels hibernate?
No. Squirrel species differ significantly. Most tree squirrels do not hibernate, while many ground squirrel species do.
Related Articles
Do Squirrels See People?(Coming soon)
Do Squirrels Remember Humans?(Coming soon)
Can Squirrels See in the Dark?(Coming soon)
Do Squirrels Sleep at Night?(Coming soon)
What Do Squirrels Eat?(Coming soon)
Where Do Squirrels Live?(Coming soon)
Exact References for the Article
I'd use 4 references, not 10. MFJ doesn't need a giant bibliography just for the sake of looking authoritative.
Reference 1 — National Park Service: Douglas's Squirrel
The NPS explains that Douglas's squirrels do not hibernate and prepare for winter by storing food. It also describes their use of tree cavities and dreys as nighttime shelter.
National Park Service — Douglas's Squirrel
Reference 2 — National Park Service: Arctic Ground Squirrel
This is your strongest source for the true hibernation side. NPS states that Arctic ground squirrels are obligate hibernators and can spend 7–8 months in hibernation.
National Park Service — Arctic Ground Squirrel
Reference 3 — National Park Service: Golden-Mantled Ground Squirrel
NPS describes the golden-mantled ground squirrel as a true hibernator and explains how it builds up fat reserves before winter.
National Park Service — Golden-Mantled Ground Squirrel
Reference 4 — National Park Service: Squirrels and Chipmunks
This page is useful because it puts several squirrel species side-by-side and demonstrates that winter behavior varies between species.