Squirrels in Illinois: Identification Guide and Where to Start Looking
Yes, squirrels are common across Illinois. The state hosts three main species: the eastern gray squirrel, fox squirrel, and the less common southern flying squirrel. Start checking local parks and woodlands, especially in oak-hickory forests, for the best odds of a sighting.
Yes, squirrels are common across Illinois. The state hosts three main species: the eastern gray squirrel, fox squirrel, and the less common southern flying squirrel. Start checking local parks and woodlands, especially in oak-hickory forests, for the best odds of a sighting.
What squirrel species live in Illinois?
Illinois is home to three squirrel species: the eastern gray squirrel (Sciurus carolinensis), the fox squirrel (Sciurus niger), and the southern flying squirrel (Glaucomys volans). The eastern gray is the most widespread, often seen in urban parks. Fox squirrels favor more open woodlands and are slightly larger with a rusty belly. Flying squirrels are nocturnal and seldom seen without specific effort.
Where in Illinois are you most likely to see squirrels?
Squirrels inhabit every county in Illinois, but you will notice them most often in areas with mature oak-hickory forests, such as Shawnee National Forest in the south, Starved Rock State Park, and forest preserves around Chicago. They also thrive in suburban neighborhoods with large trees. For consistent sightings, start with any local park that has a mix of hardwood trees.
What is the best time of year to spot squirrels in Illinois?
Squirrels are active year-round, but early morning and late afternoon offer the best viewing windows. Fall is especially productive because squirrels are busy gathering acorns and hickory nuts. In winter, you can spot them on sunny days when they come out to feed. Spring and summer see two breeding peaks, so activity remains high.
See ourstate animal guidefor the next step.
How can you tell an eastern gray squirrel from a fox squirrel?
Size and color are the main clues. Fox squirrels are larger, often up to 30 inches long including the tail, while eastern grays average about 18 inches. Fox squirrels typically have a reddish-brown back and yellowish belly, whereas eastern grays are mostly gray with a white belly. The tail also differs: fox squirrels have a broader, more bushy tail with orange edges. For more separation tips, check oursquirrel identification guide.
What are the key field marks for identifying Illinois squirrels?
Look at ear tufts (fox squirrels have prominent ones in winter), tail fur (gray squirrels have white-tipped hairs), and belly color. Eastern grays show a clean white belly; fox squirrels have a rusty or orange wash. The southern flying squirrel is small (10 inches), with a flat tail and large eyes, but you will rarely see it unless you spotlight at night. These details help confirm which species you are seeing.
Where can you find the southern flying squirrel in Illinois?
Southern flying squirrels are restricted to the southern third of Illinois, mainly in mature forests with plenty of dead snags for nesting. They are strictly nocturnal, so your best chance is to listen for soft chattering after dark or set up a feeder with sunflower seeds. Use a red-filtered flashlight to avoid spooking them. The Illinoiswildlife pagehas more on nocturnal species.
What gear can help you enjoy squirrel watching in Illinois?
While you do not need specialized equipment, a good pair of binoculars helps confirm field marks. A field guide is useful for comparing species. If you want to show off your squirrel sightings, consider a wildlife-themed t-shirt. Easy Street Markets offers a few options:
### Wild Wings Wildlife T-Shirt Gray Squirrel Unisex Graphic Tee For Men & Women
This shirt features a realistic gray squirrel print on 100% cotton. Great for wearing on your next park visit.Check Price and Availability
### Squirrel Lover Vintage T-Shirt
A retro-style tee for anyone who appreciates squirrels. Affordable and comfortable.Check Price and Availability
### Vintage Squirrel Graphic Tee
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Browse our full selection ofwildlife t-shirtsfor more options.
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A strong match for this wildlife page and an easy next click after the guide.Check Price and Availability
What are common questions about identifying squirrels in Illinois?
**Are there all-black squirrels in Illinois?** Yes, melanistic eastern gray squirrels occur rarely, mostly in northern Illinois. They are the same species, just with extra pigment.
**Do fox squirrels and gray squirrels interbreed?** No, they are separate species and do not produce hybrids, though they may share habitat.
**How can I tell a juvenile from an adult?** Juveniles have a thinner tail and a narrower head. By late summer, young of the year are nearly adult size.
**What is the difference between a tree squirrel and a ground squirrel?** Illinois has no native ground squirrels (except the thirteen-lined ground squirrel in western grasslands). Tree squirrels have bushy tails and climb readily.
For more on squirrel behavior, visit oursquirrel species page.
See ourtour planning ideasfor the next step.