Based on 2,086 research-grade iNaturalist observations in Wisconsin, Black Swallowtail is most often recorded in August; in Wisconsin it behaves like a summer visitor / breeder. It ranks #6 among butterflies recorded in the state in our data.
Papilio polyxenes
Black Swallowtail in Wisconsin 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 Wisconsin in August
Monarch
Eastern Tiger Swallowtail
Silver-spotted Skipper
Small White
Eastern Giant Swallowtail
Peck's Skipper
Great Spangled Fritillary
Eastern Tailed-Blue
Places to look in Wisconsin
State ParkAztalan State Park
State ParkWyalusing State Park
National ForestChequamegon–Nicolet National Forest
State ParkMerrick State Park
State ParkPerrot State Park
State ParkLake Kegonsa State Park
FAQ
When does Black Swallowtail appear in Wisconsin?
Mainly June–September, with the most records in August.
How common is Black Swallowtail in Wisconsin?
It ranks #6 by number of iNaturalist observations among butterflies in Wisconsin (2,086 records in our sample).