Based on 2,632 research-grade iNaturalist observations in Illinois, Tree Swallow is most often recorded in April; in Illinois it behaves like a seasonal. It ranks #51 among birds recorded in the state in our data.
Tachycineta bicolor
Tree Swallow 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 Tree Swallow appear in Illinois?
Mainly April–June, with the most records in April.
How common is Tree Swallow in Illinois?
It ranks #51 by number of iNaturalist observations among birds in Illinois (2,632 records in our sample).