Based on 5,525 research-grade iNaturalist observations in Illinois, Red-bellied Woodpecker is most often recorded in April; in Illinois it behaves like a spring and fall migrant. It ranks #16 among birds recorded in the state in our data.
Melanerpes carolinus
Red-bellied Woodpecker 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
Cahokia
Botanical GardenMorton Arboretum
Shawnee National Forest
Chicago Botanic Garden
Ladd Arboretum
State ParkStarved Rock State Park
FAQ
When does Red-bellied Woodpecker appear in Illinois?
Mainly September–June, with the most records in April.
How common is Red-bellied Woodpecker in Illinois?
It ranks #16 by number of iNaturalist observations among birds in Illinois (5,525 records in our sample).