Based on 1,320 research-grade iNaturalist observations in Michigan, Eastern Giant Swallowtail is most often recorded in August; in Michigan it behaves like a summer visitor / breeder. It ranks #12 among butterflies recorded in the state in our data.
Heraclides cresphontes
Eastern Giant Swallowtail in Michigan 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 Michigan in August
Monarch
Eastern Tiger Swallowtail
Silver-spotted Skipper
Peck's Skipper
Black Swallowtail
Spicebush Swallowtail
Small White
Zabulon Skipper
Places to look in Michigan
Wilderness AreaIsle Royale National Park
Botanical GardenBelle Isle Park
Botanical GardenFrederik Meijer Gardens & Sculpture Park
Botanical GardenLeila Arboretum
Botanical GardenNichols Arboretum
State ParkGrand Mere State Park
FAQ
When does Eastern Giant Swallowtail appear in Michigan?
Mainly July–August, with the most records in August.
How common is Eastern Giant Swallowtail in Michigan?
It ranks #12 by number of iNaturalist observations among butterflies in Michigan (1,320 records in our sample).