Based on 2,305 research-grade iNaturalist observations in Illinois, Viceroy is most often recorded in August; in Illinois it behaves like a summer visitor / breeder. It ranks #18 among butterflies recorded in the state in our data.
Limenitis archippus
Viceroy 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
Common Buckeye
Small White
Eastern Tailed-Blue
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 Viceroy appear in Illinois?
Mainly July–September, with the most records in August.
How common is Viceroy in Illinois?
It ranks #18 by number of iNaturalist observations among butterflies in Illinois (2,305 records in our sample).