You’ll often spot a mother squirrel looking round and ready to give birth after just about six weeks. Most tree squirrels stay pregnant for roughly 38–46 days, so babies usually arrive a little over a month after mating.
Curious about when squirrel litters show up, how many babies to expect, or where moms prefer to nest? Here’s a quick rundown on their breeding timeline, the kinds of nests they use, and how babies develop.
If you ever stumble across a baby ground or tree squirrel near your place, you’ll also find a few tips on what to do next.
Squirrel Reproduction and Breeding Timeline
Squirrels don’t waste time—pregnancy is short, and the babies arrive right when food’s most plentiful. You’ll notice two main breeding seasons each year.
Litters need a lot of attention in the first weeks, and mothers rarely leave them alone.
How Long Are Squirrels Pregnant?
Most tree squirrels stay pregnant for about 38–46 days. So, from mating to birth, it’s usually just around six weeks.
Females build or reuse a drey or tree cavity and stick close to the nest as birth gets closer.
Newborns arrive blind and hairless. Mothers nurse them frequently and keep them warm until their fur grows in and their eyes open at about 3–4 weeks.
By 8–10 weeks, the kits get weaned, start nibbling on solid food, and venture out of the nest for brief, supervised trips.
Typical Litter Size and Frequency
Litter size depends on the squirrel’s species and health. Most tree squirrels have 2–4 kits per litter, but sometimes you’ll see as many as 8.
Ground squirrels and some other types can have even bigger litters.
Usually, tree squirrels breed twice a year—a spring litter and another in summer. If food’s scarce or the female is young, she might skip a season or have fewer babies.
You’ll notice more frequent or bigger litters where food and shelter are easy to find.
Gestation Period by Squirrel Species
Timelines shift a bit between species. Eastern gray squirrels average about 43–44 days for gestation.
Red squirrels go a little faster, around 35–38 days. Fox squirrels and bigger species lean toward the longer end.
The timing of breeding seasons also changes by species and where they live. In temperate regions, breeding peaks in late winter or early spring, then again in mid-summer.
If you want more details for specific species, check out this guide on when squirrels have babies.
Nesting, Development, and What to Do If You Find a Baby Squirrel
Wondering where squirrels set up their nests or how their babies grow? You’ll find out here—plus, how to tell if they’ve moved in nearby.
This can help you figure out when a baby squirrel needs help and when it’s best to just let nature do its thing.
Where Squirrels Build Their Nests
Squirrels usually build one of two nest types: tree dreys or cavity nests. Dreys look like round leafy bundles wedged into forked branches.
They use twigs, leaves, and grass to keep it cozy. Cavity nests hide inside tree holes, roof soffits, attics, or wall spaces when trees aren’t around.
Inside houses, squirrels gather shredded insulation, paper, and leaves to make their nests soft. These indoor nests can cause trouble—chewed wires, even fire risks.
If you spot piles of nesting stuff, hear scratching or chirping at dawn or dusk, or see fresh holes in your eaves, there’s probably a squirrel nest nearby.
If a nest is inside your home, call a licensed wildlife control or humane squirrel removal service. They know how to remove animals legally and seal up entry points.
If the nest isn’t causing problems, it’s usually better to leave a wild mother and her babies alone unless there’s real danger.
Stages of Newborn Squirrel Development
Squirrels give birth after about 44 days of pregnancy. Newborns come out pink, blind, and hairless for the first week.
By weeks two or three, they start growing fur and opening their eyes. At about six weeks, they begin exploring outside the nest.
Between 8 and 12 weeks, most young squirrels learn to climb and forage for themselves. The mother keeps feeding and watching over them until they can climb and jump well.
If you find a tiny, pink, or very still baby, it probably needs help. Older, fuzzy juveniles might just be out exploring but will return to the nest.
If you spot a baby squirrel, watch from a distance for an hour or two to see if the mother comes back. Don’t try to feed or handle it.
Reach out to a licensed wildlife rehabilitator for advice or to take the little one in. They know exactly how to care for, warm, and eventually release young squirrels safely.
Signs of Squirrels Nesting Near Homes
You might hear scratching, scurrying, or those high-pitched chirps inside your walls or under the eaves—usually early in the morning or around sunset. Keep an eye out for freshly chewed holes in soffits, fascia, or vents, and those small, round entry points up near your roofline.
Sometimes, you’ll spot shredded insulation, leaves, or bits of nesting debris right below the roof edges. Head up to your attic and you might find droppings, greasy marks along the rafters from their repeated little paths, or even chewed-up wiring.
Out in the yard, notice if squirrels keep visiting the same tree fork or if there’s a messy drey sitting in the upper branches. If any of this sounds familiar and you’re worried about chewed wires or possible damage, it might be time to call a wildlife control pro who knows how to handle squirrels humanely—and fix things up afterward.
