Based on 4,812 research-grade iNaturalist observations in Maine, Monarch is most often recorded in August; in Maine it behaves like a summer visitor / breeder. It ranks #1 among butterflies recorded in the state in our data.
Danaus plexippus
Monarch in Maine 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 Maine in August
American Lady
Great Spangled Fritillary
Common Wood-Nymph
Small White
Common Ringlet
American Copper
Viceroy
Red Admiral
Places to look in Maine
State ParkBaxter State Park
State ParkFort Halifax
State ParkTwo Lights State Park
State ParkQuoddy Head State Park
State ParkFort Point State Park
State ParkPopham Beach State Park
FAQ
When does Monarch appear in Maine?
Mainly July–September, with the most records in August.
How common is Monarch in Maine?
It ranks #1 by number of iNaturalist observations among butterflies in Maine (4,812 records in our sample).