Based on 3,493 research-grade iNaturalist observations in Maryland, Zebra Swallowtail is most often recorded in June; in Maryland it behaves like a summer visitor / breeder. It ranks #12 among butterflies recorded in the state in our data.
Eurytides marcellus
Zebra 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 June
Eastern Tiger Swallowtail
Silver-spotted Skipper
Great Spangled Fritillary
Small White
Zabulon Skipper
Eastern Tailed-Blue
Monarch
Little Wood Satyr
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 Zebra Swallowtail appear in Maryland?
Mainly April–August, with the most records in June.
How common is Zebra Swallowtail in Maryland?
It ranks #12 by number of iNaturalist observations among butterflies in Maryland (3,493 records in our sample).