You might spot a ball of leaves way up in a tree or a cozy hole in a trunk and wonder—how did that get there? Squirrels actually build two main types of homes: leafy dreys on branches and hollow dens inside trees. They use twigs, leaves, moss, and whatever soft stuff they can find to stay safe and warm.
Once you know this, it gets way easier to notice where nests hide and what each type does for a squirrel’s shelter or raising their young.
Let’s talk about where squirrels actually like to build, how they weave and line their nests, and—believe it or not—why they sometimes pick attics or even car engines over trees.
Stick around, because the clever steps squirrels use to make a home are honestly impressive. They really know how to protect themselves from weather and predators.
How Squirrels Nest and Where They Build Nests
Squirrels make different kinds of homes for shelter, raising their young, and staying warm. You’ll get to see what materials they pick, where they put their nests, and how different species or habitats change their choices.
Types of Squirrel Nests (Dreys, Dens, and Burrows)
Dreys are those round, leafy nests you notice in tree forks. Squirrels weave twigs into a loose frame, then stuff in leaves, moss, and soft lining.
A typical drey ends up about 6–24 inches across, depending on the branch. Dreys work well for short-term shelter and summer days.
Dens are cavities inside tree trunks or big limbs. A tree hollow gives much stronger shelter against wind and hungry predators.
Squirrels add shredded bark, grass, and fur to make it cozy. You’ll find dens in older trees or sometimes in old woodpecker holes.
Some squirrels, like ground squirrels, dig burrows underground. These burrows have tunnels and little chambers for sleeping or hiding food.
You’ll see these more in open fields—burrows keep squirrels cool and safe from a lot of predators. Each nest type fits a squirrel’s daily needs and the local habitat.
Where Do Squirrels Nest in the Wild and Urban Areas
In forests, most nests sit high in mature trees—oak, elm, or pine are favorites. Squirrels pick strong forks or cavities where branches hide the drey from sight.
Tree hollows make the best winter dens since they block wind and keep in heat.
In cities and towns, squirrels get creative. They build dreys in street trees, sneak into attics and eaves, and sometimes settle in sheds or even car engines.
You might notice a leaf nest close to the trunk or tucked into thick needles. Urban squirrels don’t mind using human stuff—insulation, fabric, or paper—for lining.
Ground-nesting species skip the trees and dig into soil near rocks, logs, or shrubs. Where food and cover are good, squirrels will set up several nests in a small area and switch between them as needed.
Species Differences in Squirrel Nesting (Red, Gray, and Flying Squirrels)
Gray squirrels often build several dreys and will use a tree hollow den if they find one. You’ll spot a few leaf nests scattered across their territory for resting or as backup if something attacks one.
Red squirrels usually build dreys close to the trunk, often in conifer forests. They like shredded bark and moss for lining and will take over small tree cavities when they can.
Red squirrels defend their nesting areas more aggressively than grays.
Flying squirrels go for tree cavities and nest boxes instead of exposed dreys. These interior spots work better since flying squirrels are nocturnal and need steady, warm places for their young.
You might even find them in nest boxes you’ve hung in mature trees.
Squirrel Nest Construction and Purpose
Squirrels build round, insulated homes up in trees or tucked inside cavities. You’ll get a look at how they actually pull this off, what materials they use, and how they care for their young as seasons change.
How Squirrels Build Their Nests (Step-by-Step)
Squirrels pick a strong fork or branch 20–60 feet up, or they go for a tree cavity if they want extra shelter. They start by laying down a rough frame of twigs to make a bowl shape.
Then they weave in thinner twigs to create a tighter outer shell. This layer gives the drey its structure and helps it stand up to wind.
You’ll usually see a small, downward-facing entrance to keep out rain.
After that, they add soft lining—dry leaves, moss, grass, or shredded bark—to trap heat. Female squirrels sometimes build a few dreys in their territory so they can move their young if something disturbs a nest.
Squirrels can slap together a basic nest in a day if it’s an emergency, but usually, they keep reinforcing and repairing it over weeks.
They keep adding new material as the seasons shift.
Materials Used for Squirrel Nest Construction
Squirrels grab whatever’s handy in the yard or woods. Twigs and small branches make the frame.
Leaves and grass form the warm inner lining that keeps babies and adults insulated.
They’ll also use moss, bark, and sometimes fur or feathers for extra softness. In cities, you might see them sneak in paper, bits of cloth, or even insulation from attics.
Squirrels chew pine cones and strip bark while gathering and shaping nesting materials. That chewing also makes twigs flexible for weaving.
Mature trees with thick cover give the best hiding spots for their nests and materials.
Female squirrels, especially in late fall, collect the best lining they can find to get ready for winter and the nesting season.
Why Do Squirrels Build Nests and What Do They Look Like
Squirrels build nests for shelter, warmth, and safety from predators. A typical drey looks like a rounded bundle, about 8–12 inches across, camouflaged with leaves and bark.
Dreys usually sit in forks or thick branches and have a small, sealed entrance facing downward. This keeps rain and hawks away.
When squirrels use tree cavities, the nest is a lined chamber inside the trunk instead of a visible ball.
You’ll often see several nests in one territory—a main drey for winter and smaller ones for resting or as escape routes.
Males and females don’t always use nests the same way. Breeding females go for the warmest, best-lined spots for raising young.
Raising Young and Seasonal Nesting Behaviors
Females give birth in spring, and sometimes they’ll do it again in summer. They pick out the warmest, safest nest they can find and really pile in the lining to keep baby squirrels safe from cold and bugs.
You’ll spot mothers nursing and hiding their pups away for weeks at a time. As the babies get bigger, they start venturing between nearby dreys, trying out short trips on branches while mom keeps a close eye on them.
When fall rolls around, squirrels start ramping up their nesting work for winter. They stuff in extra leaves for insulation and, if they can, switch over to cavity nests. You might catch them patching up holes, swapping out old lining, or even building new nests if weather or predators force them to move.
