Based on 13,637 research-grade iNaturalist observations in Maryland, Eastern Tiger Swallowtail is most often recorded in August; in Maryland it behaves like a summer visitor / breeder. It ranks #1 among butterflies recorded in the state in our data.
Papilio glaucus
Eastern Tiger Swallowtail in Maryland 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 Maryland in August
Monarch
Zabulon Skipper
Huron Skipper
Silver-spotted Skipper
Spicebush Swallowtail
Pearl Crescent
Common Buckeye
Black Swallowtail
Places to look in Maryland
State ParkWashington Monument State Park
State ParkPatapsco Valley State Park
State ParkSeneca Creek State Park
State ParkCalvert Cliffs State Park
State ParkSusquehanna State Park
State ParkGambrill State Park
FAQ
When does Eastern Tiger Swallowtail appear in Maryland?
Mainly July–September, with the most records in August.
How common is Eastern Tiger Swallowtail in Maryland?
It ranks #1 by number of iNaturalist observations among butterflies in Maryland (13,637 records in our sample).