Based on 2,107 research-grade iNaturalist observations in Indiana, Eastern Chipmunk is most often recorded in September; in Indiana it behaves like a spring and fall migrant. It ranks #5 among mammals recorded in the state in our data.
Tamias striatus
Eastern Chipmunk 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 September

Eastern Fox Squirrel

Eastern Gray Squirrel

White-tailed Deer

Eastern Cottontail

Groundhog

Common Raccoon

American Red Squirrel

Virginia Opossum
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 Chipmunk appear in Indiana?
Mainly September–October, with the most records in September.
How common is Eastern Chipmunk in Indiana?
It ranks #5 by number of iNaturalist observations among mammals in Indiana (2,107 records in our sample).