Based on 6,130 research-grade iNaturalist observations in Pennsylvania, Small White is most often recorded in July; in Pennsylvania it behaves like a summer visitor / breeder. It ranks #4 among butterflies recorded in the state in our data.
Pieris rapae
Small White 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
Huron Skipper
Red Admiral
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 Small White appear in Pennsylvania?
Mainly June–October, with the most records in July.
How common is Small White in Pennsylvania?
It ranks #4 by number of iNaturalist observations among butterflies in Pennsylvania (6,130 records in our sample).