Ever spot a squirrel darting across the snow and wonder if something’s off? Actually, lots of squirrels stay out and about in winter, but some sleep more or hide in their nests—others even hibernate, depending on the species. Figuring out what kind of squirrel you’re seeing helps you know what’s normal and what’s not.
Tree squirrels often show up on cold days, while ground squirrels might disappear underground for weeks. We’ll look at how squirrels find food, build shelters, and use fat and fur to get through winter. That way, you can spot what’s normal and what’s a red flag.
Should Squirrels Be Out in Winter?
Squirrels do stay active in cold weather, but they change up their routines to save energy and survive. You’ll notice when they move, how their sleep states work, and why eastern gray and red squirrels don’t act the same way.
Winter Activity Patterns of Squirrels
Most tree squirrels—like eastern grays and fox squirrels—keep moving through winter. You’ll spot them on warmer days, digging up nuts, seeds, and buds they stashed earlier.
When it’s bitter cold or windy, they cut back on activity and hang out in dreys or tree cavities to stay warm.
Squirrels move mostly in late morning or early afternoon, when it’s a little warmer. Instead of wandering far, they make quick trips to grab food and head straight back.
That’s a clever way to save fat and dodge the worst of the cold.
City squirrels sometimes raid bird feeders or sneak into attics for extra food and warmth. Just because you see a squirrel outside in winter doesn’t mean it’s in trouble—being out is totally normal for a lot of them.
Hibernation vs. Torpor: What Really Happens
People say squirrels hibernate, but that’s not always true. Only some ground squirrels really hibernate.
Tree squirrels don’t do the months-long sleep. Instead, they use torpor—short periods where their body temperature drops for a few hours.
Torpor lets tree squirrels save energy during sudden cold snaps. They can snap out of it fast if they need to find food or move to a warmer spot.
Ground squirrels and marmots, on the other hand, go into deep hibernation with slow heartbeats and long, deep sleep. That’s a whole different survival game.
If you see a curled-up, cold squirrel on the ground, it might be stunned, hurt, or just in torpor. Don’t pick it up—call a wildlife rehabilitator. Knowing the difference really matters.
How Species Differ in Winter Behavior
Different squirrels have their own winter tricks. Eastern gray squirrels and fox squirrels stash food all over the place and grow thicker fur for winter.
When fresh food runs out, they switch to buds, bark, or their hidden nuts.
Red squirrels stick closer to their nests and get pretty territorial about their food stores. Southern flying squirrels, which are nocturnal, often pile into one nest to keep warm. They munch on fungi and stored seeds at night.
Ground squirrels—like the thirteen-lined kind—hibernate in burrows and don’t follow the same patterns as tree squirrels.
If you spot a squirrel, figuring out its species helps you decide if its behavior is normal or not.
Check out more info on tree squirrels’ winter habits at Do Squirrels Come Out In Winter?.
How Squirrels Survive the Cold Season
Squirrels get through winter by staying warm, eating their stashed food, and hiding out in shelters that block wind and trap heat. You’ll notice they spend more time in nests or underground, only popping out on mild days to grab hidden snacks. Their body fat and thicker fur do a lot of the heavy lifting.
Squirrel Nests and Winter Shelters
Tree squirrels usually shelter in dreys or tree cavities. Dreys are those round nests made of twigs, leaves, and moss, wedged into the crook of a branch.
Tree cavities are even better—they insulate against wind and keep predators out.
Sometimes, squirrels move into attics, under porches, or piles of junk when they can’t find a good natural spot.
Ground squirrels and some flying squirrels choose burrows or underground nests. Southern flying squirrels love tree cavities and often squeeze in together for warmth.
They line their nests with grass, feathers, and whatever soft stuff they can find—sometimes you’d never notice from the outside.
Squirrels look for spots that face away from the wind and aren’t far from food. That way, they don’t have to risk leaving the nest too often when it’s freezing out.
If you hear scurrying in your attic, those squirrels probably picked it for the steady warmth and safety.
Food Storage and Scatter Hoarding
Squirrels prep for winter by hiding food in lots of small spots. That’s called scatter hoarding.
You’ll see them bury nuts, acorns, and seeds in shallow holes all over—under trees, in lawns, even beneath leaf piles.
They mostly use memory and smell to dig up their caches later, though they definitely miss a few.
Stored food lets squirrels stay holed up for days when it’s nasty outside. On milder days, they’ll dash out, dig up a snack, and zip back to safety.
Tree squirrels are notorious for raiding bird feeders or grabbing human food if they get the chance.
Sometimes they lose a cache, and that nut or seed sprouts into a new tree in spring. It’s kind of amazing how their forgetfulness helps forests grow.
Adaptations for Winter Survival
Squirrels start putting on fat before winter hits. That extra layer gives them both energy and a bit of insulation. If you watch closely in late fall, you’ll probably notice their bodies looking rounder as they bulk up.
Their fur gets thicker, too. It changes in density, which helps them fight off wind and cold.
Instead of true hibernation, squirrels slow down. They lower their activity levels and sometimes enter short bouts of torpor—basically, their body temperature and metabolism drop for a bit to save energy during really cold nights.
Ground squirrels tend to hibernate deeply. Most tree squirrels, on the other hand, stay intermittently active.
Squirrels also change their behavior quite a bit. They travel less, pick sunlit branches on cold days, and sometimes even nest together for warmth.
Southern flying squirrels often stay active at night. They rely on tree cavities and, when possible, huddle in groups for extra warmth.
