Based on 4,327 research-grade iNaturalist observations in Illinois, Double-crested Cormorant is most often recorded in April; in Illinois it behaves like a summer visitor / breeder. It ranks #23 among birds recorded in the state in our data.
Nannopterum auritum
Double-crested Cormorant 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
American Robin
Canada Goose
Red-winged Blackbird
Mallard
Northern Cardinal
House Sparrow
Brown-headed Cowbird
Common Grackle
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 Double-crested Cormorant appear in Illinois?
Mainly April–October, with the most records in April.
How common is Double-crested Cormorant in Illinois?
It ranks #23 by number of iNaturalist observations among birds in Illinois (4,327 records in our sample).