Based on 4,137 research-grade iNaturalist observations in Illinois, Eastern Tailed-Blue is most often recorded in July; in Illinois it behaves like a summer visitor / breeder. It ranks #10 among butterflies recorded in the state in our data.
Everes comyntas
Eastern Tailed-Blue 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 July
Monarch
Black Swallowtail
Red Admiral
Eastern Tiger Swallowtail
Silver-spotted Skipper
Pearl Crescent
Common Buckeye
Small White
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 Eastern Tailed-Blue appear in Illinois?
Mainly July–September, with the most records in July.
How common is Eastern Tailed-Blue in Illinois?
It ranks #10 by number of iNaturalist observations among butterflies in Illinois (4,137 records in our sample).