Based on 3,515 research-grade iNaturalist observations in Pennsylvania, Red Admiral is most often recorded in July; in Pennsylvania it behaves like a summer visitor / breeder. It ranks #11 among butterflies recorded in the state in our data.
Vanessa atalanta
Red Admiral in Pennsylvania 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 Pennsylvania in July
Eastern Tiger Swallowtail
Monarch
Silver-spotted Skipper
Spicebush Swallowtail
Great Spangled Fritillary
Small White
Huron Skipper
Black Swallowtail
Places to look in Pennsylvania
National ForestAllegheny National Forest
State ParkPresque Isle State Park
Botanical GardenJenkins Arboretum
State ParkCherry Springs State Park
State ParkColton Point State Park
State ParkLeonard Harrison State Park
FAQ
When does Red Admiral appear in Pennsylvania?
Mainly April–August, with the most records in July.
How common is Red Admiral in Pennsylvania?
It ranks #11 by number of iNaturalist observations among butterflies in Pennsylvania (3,515 records in our sample).