Based on 1,480 research-grade iNaturalist observations in Delaware, Eastern Tiger Swallowtail is most often recorded in August; in Delaware it behaves like a summer visitor / breeder. It ranks #2 among butterflies recorded in the state in our data.
Papilio glaucus
Eastern Tiger Swallowtail in Delaware 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 Delaware in August
Monarch
Huron Skipper
Zabulon Skipper
Spicebush Swallowtail
Silver-spotted Skipper
Common Buckeye
Variegated Fritillary
Red-banded Hairstreak
Places to look in Delaware
State ParkCape Henlopen State Park
Botanical GardenWinterthur Museum, Garden and Library
State ParkTrap Pond State Park
State ParkKillens Pond State Park
State ParkBellevue State Park
State ParkBrandywine Creek State Park
FAQ
When does Eastern Tiger Swallowtail appear in Delaware?
Mainly July–September, with the most records in August.
How common is Eastern Tiger Swallowtail in Delaware?
It ranks #2 by number of iNaturalist observations among butterflies in Delaware (1,480 records in our sample).