Based on 5,679 research-grade iNaturalist observations in Illinois, Common Buckeye is most often recorded in August; in Illinois it behaves like a summer visitor / breeder. It ranks #7 among butterflies recorded in the state in our data.
Junonia coenia
Common Buckeye 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 August
Monarch
Eastern Tiger Swallowtail
Silver-spotted Skipper
Black Swallowtail
Pearl Crescent
Small White
Eastern Tailed-Blue
Hackberry Emperor
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 Common Buckeye appear in Illinois?
Mainly July–October, with the most records in August.
How common is Common Buckeye in Illinois?
It ranks #7 by number of iNaturalist observations among butterflies in Illinois (5,679 records in our sample).