Based on 9,485 research-grade iNaturalist observations in New Jersey, Monarch is most often recorded in August; in New Jersey it behaves like a summer visitor / breeder. It ranks #1 among butterflies recorded in the state in our data.
Danaus plexippus
Monarch 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
Eastern Tiger Swallowtail
Zabulon Skipper
Silver-spotted Skipper
Spicebush Swallowtail
Huron Skipper
Red-banded Hairstreak
Black Swallowtail
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 Monarch appear in New Jersey?
Mainly July–October, with the most records in August.
How common is Monarch in New Jersey?
It ranks #1 by number of iNaturalist observations among butterflies in New Jersey (9,485 records in our sample).