Based on 1,356 research-grade iNaturalist observations in Massachusetts, Gray Hairstreak is most often recorded in August; in Massachusetts it behaves like a summer visitor / breeder. It ranks #14 among butterflies recorded in the state in our data.
Strymon melinus
Gray Hairstreak 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 August
Monarch
Zabulon Skipper
Small White
Peck's Skipper
Eastern Tiger Swallowtail
Spicebush Swallowtail
American Copper
Red-spotted Admiral
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 Gray Hairstreak appear in Massachusetts?
Mainly July–September, with the most records in August.
How common is Gray Hairstreak in Massachusetts?
It ranks #14 by number of iNaturalist observations among butterflies in Massachusetts (1,356 records in our sample).