Based on 16,416 research-grade iNaturalist observations in Illinois, Canada Goose is most often recorded in April; in Illinois it behaves like a seasonal. It ranks #1 among birds recorded in the state in our data.
Branta canadensis
Canada Goose 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
Red-winged Blackbird

Mallard

Northern Cardinal

House Sparrow

Brown-headed Cowbird

Common Grackle

Mourning Dove
Places to look in Illinois
Cahokia
Botanical GardenMorton Arboretum
Shawnee National Forest
Chicago Botanic Garden
Ladd Arboretum
State ParkStarved Rock State Park
FAQ
When does Canada Goose appear in Illinois?
Mainly February–June, with the most records in April.
How common is Canada Goose in Illinois?
It ranks #1 by number of iNaturalist observations among birds in Illinois (16,416 records in our sample).