You’ll spot baby squirrels most often in spring and again in late summer, but the exact timing really depends on the species and your local climate. Most tree squirrels breed twice a year: late winter–early spring and mid-summer. Gestation usually runs 38–46 days, and most litters have 2–5 young.
Curious about when to expect nests, how long kits stay in the drey, or how gray, red, and flying squirrels differ? This article walks through timelines and clues to look for.
Keep reading for the specific seasons by species and a peek at what nesting looks like in your area.
When Do Squirrels Have Babies?
Squirrels usually have babies twice a year if food is steady. Timing and litter size shift depending on the species and where you live.
Expect spring and summer births in a lot of places.
Typical Breeding Seasons
Most tree squirrels breed twice: once in late winter or early spring, then again in mid-summer. For example, eastern gray squirrels mate December–February for spring litters and again May–June for summer babies.
Litters show up about 38–46 days after mating, so you’ll see newborns in February–March and again in July–August in many regions.
Ground squirrels and some fox squirrels usually breed just once, typically in spring when plants start growing. Flying squirrels do about the same, but they’re tough to spot since they’re out at night.
Squirrel Gestation Period
Gestation for most squirrels runs about 38–46 days. That means if they mate in January, you might see kits in March.
Litter sizes usually fall between 2 and 5 young, but it varies by species and the mother’s health.
Newborns arrive blind and hairless. Mothers tuck them away in a drey or tree cavity until the babies open their eyes and start to move.
Kits leave the nest and begin foraging around 6–10 weeks after birth.
How Location and Climate Impact Birth Timing
Warmer areas push breeding earlier and can stretch out the season. In southern states or along the coast, first litters might show up as early as January.
Northern states usually see first litters in March or April. Harsh winters can delay mating and cut down the chance of a second litter.
Food makes a big difference. If spring nuts and seeds are scarce, some squirrels skip the second litter or have fewer babies.
Cities with birdfeeders or food waste help squirrels breed more consistently than wild areas with boom-and-bust food cycles.
Check out this guide for more details about regional timing and species differences: when squirrels have babies.
Differences Between Squirrel Species
Timing, litter size, and nesting spots vary by species. Some squirrels breed twice a year, others just once, and your location shapes those schedules.
Gray Squirrels Birth Schedule
Gray squirrels (like the eastern gray) usually breed twice a year. The first mating season starts in late winter, so you’ll see babies—called kits—around February to March.
The second round happens in late spring, with litters showing up in July or August. Gestation lasts about 38–45 days, and most litters have 2–4 kits.
If you notice more nests in trees or attics during those months, a pregnant female might be prepping a drey or using a tree cavity.
Try not to disturb nests; the mother comes back often to feed and clean her young.
Red Squirrels Reproduction Patterns
Red squirrels usually time births a bit later than grays. First litters often pop up in March or April, after the last hard frosts.
A second litter can happen in late summer, around August or September, but it really depends on food like conifer seeds.
Litter sizes run from 2–5 kits. Red squirrels build snug nests in trees or cavities and fiercely defend their territories while raising young.
If you hear loud, territorial noises near nests, a female might be protecting her kits and food stores.
Fox Squirrels and Ground Squirrels
Fox squirrels generally breed once, mainly in late winter, with young arriving in early spring. Their litters are about the same size as gray squirrels—usually 2–4 kits.
Fox squirrels like bigger tree cavities and open-canopy spots for nesting, so you’ll spot signs higher up in the trees.
Ground squirrels do things differently. Many ground species breed once in spring after waking up from winter dormancy.
Timing depends on local climate and when plants start growing. Ground squirrel litters can be bigger, and mothers raise their young in burrows.
If you see colonies active in spring fields, that’s when kits are probably around.
Flying Squirrels Timeline
Flying squirrels keep to themselves and move around at night, so watching their routines isn’t easy. They usually have two breeding seasons, like tree squirrels. First litters show up in spring (March–May), and then you might see a second round in late summer (August–September), at least in most places.
Gestation lasts about the same as tree squirrels. Most litters have 2–4 pups.
You’ll spot flying squirrel nests tucked inside tree cavities or in nest boxes, not in open dreys. Since they’re out after dark, try listening for their soft chittering near those cavities around dusk.
If you manage nest boxes, pay attention to the timing. That way, you won’t accidentally bother females during these important months.
