Ever wonder where all those squirrels disappear to when winter hits? Most tree squirrels don’t hibernate like ground squirrels; they save energy with short torpor spells, rely on their hidden food stashes, and curl up in cozy nests. So, you’ll probably still catch glimpses of them on milder days or after a storm.
Let’s dig into which squirrels actually hibernate, how tree squirrels handle the cold, and the clever ways they stay fed and warm. Curious about what you’ll see in your yard this winter? Or why some squirrels seem to vanish while others keep darting around? You’re in the right place.
Do Squirrels Hibernate in the Winter?
Most squirrels you spot in yards don’t snooze through winter. Some ground species actually hibernate for months, with their body temperatures dropping way down.
But most tree squirrels? They just take short breaks called torpor, stash food, and pop out when it’s warm enough.
What Hibernation Really Means for Squirrels
Hibernation is a deep sleep where an animal’s body temperature, heart rate, and metabolism drop really low. Ground squirrels like the Arctic ground squirrel can almost freeze, and their hearts slow way down.
That’s how they make it through winter without eating for months, just burning through fat reserves.
Torpor isn’t the same as hibernation. Tree squirrels—like gray squirrels and fox squirrels—use torpor for hours or a couple of days at a time.
When it’s brutally cold, they curl up in their nests or tree holes, but they wake up more easily to snack on their hidden food. You might find a squirrel in torpor tucked away during a cold snap, looking pretty cozy.
Ground Squirrels Versus Tree Squirrels
Ground squirrels dig burrows to hide from the cold and predators. Species like the Arctic ground squirrel and the thirteen-lined ground squirrel tunnel deep and hibernate for months.
They live off their body fat and rarely peek above ground until spring comes around.
Tree squirrels do things differently. They build messy nests called dreys or use hollow trees, and they stay active more often.
Eastern gray squirrels, fox squirrels, and red squirrels spend fall hiding food all over their territory. When it’s freezing, they slow down and use torpor, but they’ll still come out to eat if the weather gives them a break.
If you see squirrels in your yard during winter, they’re probably using this torpor strategy, not true hibernation.
Species That Hibernate and Those That Don’t
Some ground squirrels are true hibernators—think Arctic ground squirrels and thirteen-lined ground squirrels. They drop their body temperature for months and don’t come up until spring.
Most tree squirrels—including eastern gray squirrels, fox squirrels, and red squirrels—don’t hibernate. They grow thick winter coats, fatten up, and hide food everywhere.
Flying squirrels skip hibernation too, usually cuddling up together in nests to keep warm. If you’re curious about your local squirrels, check if they’re ground or tree dwellers to figure out their winter routine.
How Squirrels Survive and Stay Warm in Winter
Squirrels rely on nests, food stashes, and even changes in their bodies to get through winter. You’ll spot them hunkering down, digging up nuts on sunny days, or sometimes sharing body heat with buddies.
Winter Nests and Where Squirrels Live
Tree squirrels like eastern gray squirrels and fox squirrels build dreys—basically messy platforms of twigs and leaves—way up in the branches. You’ll often see these tucked into forked limbs or thick evergreens.
Some gray and fox squirrels pick tree cavities instead, which gives them a bit more insulation and protection from wind and hungry predators.
Red squirrels prefer cavities or stash their food near cone-heavy trees. Flying squirrels go for hollow trunks or even attics, and they often nest together.
In cities, squirrels aren’t shy about moving into attics, eaves, or wall spaces where it’s warmer and safer.
Squirrels line their nests with moss, bark, and grass. You’ll notice how they plug up entrances with leaves or debris to keep out drafts.
Building nests close to food means they don’t have to travel far in the cold, which helps them hang onto their fat reserves.
Food Storage and Foraging Behavior
Tree squirrels scatter-hoard, meaning they hide nuts and seeds in lots of little spots. Eastern gray squirrels, for example, bury acorns in leaf piles or just under the soil.
On warmer winter days, you’ll probably see them digging up these snacks.
Red squirrels do it differently—they make middens, which are big, defended piles of food near their dens. You might catch a red squirrel running back to the same stash all winter long.
Ground squirrels and chipmunks have their own routines, sometimes hibernating or relying on underground stores.
Squirrels use their memory and their noses to find hidden food. When nuts run low, they’ll nibble on bark, buds, or even fungi.
City squirrels get creative, too—they’ll munch on birdseed, fallen fruit, and whatever human food they can scavenge.
Body Changes and Group Behaviors
In the fall, squirrels start growing thicker fur and pack on extra fat. If you watch your backyard gray squirrel, you’ll notice it looks noticeably plumper as the weather cools down.
That extra fat helps some species get through short cold spells when they can’t find food. It’s kind of amazing how much they rely on those reserves.
Tree squirrels don’t actually hibernate. Instead, they use torpor—just brief, shallow dips in body temperature that last a few hours or maybe a couple of days.
Torpor helps them save energy, but they can still wake up fast if they need to eat or dart away from a predator. It’s a pretty clever adaptation, honestly.
Some squirrels act pretty social in winter. Flying squirrels, for example, often huddle together in tree cavities to share warmth.
During harsh cold snaps, you might even spot tree squirrels sharing a cavity or sticking close together in thick branches. Staying close like this really cuts down on heat loss and means they don’t have to risk foraging in terrible weather.
If you’re curious about how squirrels build their nests or use torpor, there’s more info here: how squirrels build winter-ready nests and use torpor to conserve energy (https://www.skedaddlewildlife.com/location/ottawa/blog/amazing-squirrel-adaptations-for-winter-survival/).
