Based on 2,277 research-grade iNaturalist observations in New Jersey, Black Swallowtail is most often recorded in August; in New Jersey it behaves like a summer visitor / breeder. It ranks #9 among butterflies recorded in the state in our data.
Papilio polyxenes
Black Swallowtail in New Jersey 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 New Jersey in August
Monarch
Eastern Tiger Swallowtail
Zabulon Skipper
Silver-spotted Skipper
Spicebush Swallowtail
Huron Skipper
Red-banded Hairstreak
Common Buckeye
Places to look in New Jersey
Botanical GardenDrew University
State ParkLiberty State Park
Botanical GardenWillowwood Arboretum
Botanical GardenHerrontown Woods Arboretum
State ParkWawayanda State Park
State ParkIsland Beach State Park
FAQ
When does Black Swallowtail appear in New Jersey?
Mainly June–September, with the most records in August.
How common is Black Swallowtail in New Jersey?
It ranks #9 by number of iNaturalist observations among butterflies in New Jersey (2,277 records in our sample).