Based on 14,538 research-grade iNaturalist observations in Illinois, Eastern Gray Squirrel is most often recorded in April; in Illinois it behaves like a year-round resident. It ranks #1 among mammals recorded in the state in our data.
Sciurus carolinensis
Eastern Gray Squirrel in Illinois by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in Illinois in April
Eastern Cottontail
White-tailed Deer
Common Raccoon
Eastern Fox Squirrel
Eastern Chipmunk
Muskrat
American Beaver
Virginia Opossum
Places to look in Illinois
State ParkCahokia
Botanical GardenMorton Arboretum
National ForestShawnee National Forest
Botanical GardenChicago Botanic Garden
Botanical GardenLadd Arboretum
State ParkStarved Rock State Park
FAQ
When does Eastern Gray Squirrel appear in Illinois?
Mainly August–June, with the most records in April.
How common is Eastern Gray Squirrel in Illinois?
It ranks #1 by number of iNaturalist observations among mammals in Illinois (14,538 records in our sample).