Based on 2,142 research-grade iNaturalist observations in Massachusetts, Spicebush Swallowtail is most often recorded in July; in Massachusetts it behaves like a summer visitor / breeder. It ranks #8 among butterflies recorded in the state in our data.
Papilio troilus
Spicebush Swallowtail in Massachusetts 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 Massachusetts in July
Monarch
Silver-spotted Skipper
Small White
American Copper
Red Admiral
Common Wood-Nymph
Eastern Tiger Swallowtail
American Lady
Places to look in Massachusetts
Botanical GardenArnold Arboretum
Botanical GardenBoston Public Garden
Botanical GardenBerkshire Botanical Garden
State ParkHalibut Point State Park
State ParkHammond Pond Reservation
State ParkTolland State Forest
FAQ
When does Spicebush Swallowtail appear in Massachusetts?
Mainly June–August, with the most records in July.
How common is Spicebush Swallowtail in Massachusetts?
It ranks #8 by number of iNaturalist observations among butterflies in Massachusetts (2,142 records in our sample).