Based on 9,808 research-grade iNaturalist observations in Massachusetts, Monarch is most often recorded in August; in Massachusetts it behaves like a summer visitor / breeder. It ranks #1 among butterflies recorded in the state in our data.
Danaus plexippus
Monarch 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
Zabulon Skipper
Small White
Peck's Skipper
Eastern Tiger Swallowtail
Spicebush Swallowtail
American Copper
Red-spotted Admiral
Gray Hairstreak
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 Monarch appear in Massachusetts?
Mainly July–September, with the most records in August.
How common is Monarch in Massachusetts?
It ranks #1 by number of iNaturalist observations among butterflies in Massachusetts (9,808 records in our sample).