How Do Squirrels Stay Warm in the Winter? (7 Ways)

As the winter months approach, you may be wondering: how do squirrels stay warm in the winter when temperatures drop below freezing? Unlike some mammals that hibernate during the cold seasons, most species of squirrels remain active year-round. So, how do squirrels stay warm and survive the harsh winter weather?

Squirrels stay warm in the winter through adaptations like dense fur, fat storage, and sheltering dens. They also huddle for warmth, reduce activity, and boost calorie intake before winter.

Physical and Behavioral Adaptations

Squirrels rely on a number of physical and behavioral adaptations to survive the cold. Let’s explore some of the main tactics squirrels use:

1. Fluffy Winter Coats

As autumn approaches, squirrels grow a thicker winter coat to provide insulation against the cold. Their underfur becomes denser and longer while the guard hairs on their backs also increase in length. This winter coat helps squirrels retain body heat and shrug off icy winds.

2. Increased Fat Storage

Similar to bears before hibernation, squirrels intentionally gain weight in the fall by eating surplus food. This fat accumulation, along with their fluffy fur coats, gives them a cute round appearance. The extra body fat acts as insulation and provides energy reserves when food is scarce. In preparation for winter, squirrels have the astonishing capability to augment their body weight by up to 50%.!

3. Food Caching

Squirrels spend autumn collecting and hiding away nuts, seeds, mushrooms, and other foods. By burying items in scattered caches, they create stockpiles to rely on when foraging is difficult. Food caches allow squirrels to decrease time exposed to the elements while searching for their next meal.

4. Communal Nesting

Most squirrels sleep in leaf nests called dreys. During winter, squirrels will often share nests for additional warmth. Squirrels find comfort in close proximity to one another, as it aids in preserving their precious body warmth. Dens made of twigs and leaves also provide shelter from icy winds.

5. Reduced Activity

Squirrels minimize their time in the open by cutting back on activity in winter. Outside of quick food retrieval trips, they’ll remain sheltered in dreys for days at a time. Less exposure to the cold allows squirrels to conserve precious body heat.

6. Shivering & Muscle Movement

Shivering is a way for squirrels to warm up by generating heat. They’ll shiver to raise their body temperatures as needed. Squirrels also use muscle movements like stretching and small jumps to ignite their internal furnace when chilled.

7. Sun Bathing

On sunny winter days, you may see squirrels sprawled across tree branches. Solar basking allows squirrels to gain warmth while protecting their coat from moisture. Direct sunlight helps regulate their body temperature to save energy.

Unique Adaptations of Certain Species

Beyond general tactics, some squirrel species have unique physical attributes to endure cold climates.

Black Squirrels

Research findings indicate that black squirrels display a remarkable ability to generate 11% more body heat in cold weather and also exhibit 18% better body heat retention than their gray counterparts.

This unique adaptation to withstand low temperatures has been proposed as a potential explanation for the growing dominance of black squirrels in northern climates.

Black squirrels demonstrate the capacity to survive and adapt to challenging conditions such as a harsh winter.

Red Squirrels

Fluffy ear tufts that resemble built-in earmuffs give red squirrels an advantage in extreme cold. Their ears stay toasty thanks to these elongated fur tufts.

Arctic Ground Squirrels

Unlike tree squirrels, arctic ground squirrels hibernate underground from September to April. Before dormancy, they double their weight and lower their body temperature below freezing during hibernation.

Studies also show that those squirrels are recycling bits of their own muscles in order to survive harsh winters!

Ideal Winter Habitats

Certain habitats give squirrels a leg up when braving winter weather. Here are some of the best environments for them to inhabit:

Woodlands & Forests

Tree-filled areas provide both food and shelter for squirrels. They feast on nuts and seeds from trees like oaks, maples, and pines before the snow falls. The trees also supply cavities and forked branches for dreys.

Parks & Green Spaces

Urban parks with mature trees create oases for city squirrels. They still have access to nuts and nesting sites without facing the full brunt of winter far from buildings.

Near Feeders

Backyard bird feeders are a lifeline for squirrels once natural food grows scarce. Feeders offer easily accessible calories to supplement their cache.

Attics & Garages

Squirrels often move indoors, much to homeowners’ chagrin. Attics and garages provide refuge far warmer than any drey. But this also increases squirrel damage and the need for humane removal.

Dangers Facing Squirrels in Winter

Even with adaptations to battle the cold, winter poses serious dangers to squirrels including:

Freezing Temperatures

Arctic winds can be deadly, especially when coupled with wet conditions. If squirrels become soaked to the skin, they’ll struggle to stay dry and warm. In those conditions, squirrels may freeze to death.

Lack of Food

When squirrel food caches run low, starvation becomes a real possibility. Hungry squirrels grow desperate without a stable food source.

Exposure in Nests

Dreys provide vital shelter, but they have limitations. If not properly insulated or located in windy areas, squirrel nests lack adequate protection.

Vehicle Strikes

Dashed roadside crossings put squirrels at increased risk of being hit by cars. Many fall victim while seeking food near plowed streets.


Predatory animals like hawks, coyotes, and bobcats still hunt squirrels in winter. Lack of tree cover makes squirrels more vulnerable to aerial and land predators.


To conclude, how do squirrels stay warm in the winter? Now you know the secrets behind squirrels’ winter survival tactics and their ability to stay warm amidst chilly conditions. Adaptations like thick fur, fat storage, nest sharing, and food caching allow squirrels to stay active during the winter when many other animals hibernate or migrate.

Certain species have additional attributes to endure their harsh environments. While winter is undoubtedly a struggle for squirrels, they are remarkably equipped to handle the cold and snow.

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