Based on 2,418 research-grade iNaturalist observations in Indiana, Eastern Bluebird is most often recorded in April; in Indiana it behaves like a seasonal. It ranks #11 among birds recorded in the state in our data.
Sialia sialis
Eastern Bluebird in Indiana 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 Indiana in April

American Robin
Canada Goose

Northern Cardinal

Mallard
Red-winged Blackbird

House Sparrow

Brown-headed Cowbird

Mourning Dove
Places to look in Indiana
Turkey Run State Park
Brown County State Park
Prophetstown State Park
National ForestHoosier National Forest
Mounds State Park
Falls of the Ohio State Park
FAQ
When does Eastern Bluebird appear in Indiana?
Mainly January–June, with the most records in April.
How common is Eastern Bluebird in Indiana?
It ranks #11 by number of iNaturalist observations among birds in Indiana (2,418 records in our sample).