Based on 4,894 research-grade iNaturalist observations in Illinois, Cooper's Hawk is most often recorded in September; in Illinois it behaves like a year-round resident. It ranks #18 among birds recorded in the state in our data.
Astur cooperii
Cooper's Hawk 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 September
Great Blue Heron
House Sparrow
American Goldfinch
Mallard
Canada Goose
Swainson's Thrush
Ruby-throated Hummingbird
Northern Cardinal
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 Cooper's Hawk appear in Illinois?
Mainly July–May, with the most records in September.
How common is Cooper's Hawk in Illinois?
It ranks #18 by number of iNaturalist observations among birds in Illinois (4,894 records in our sample).