Based on 4,442 research-grade iNaturalist observations in Connecticut, Monarch is most often recorded in August; in Connecticut it behaves like a summer visitor / breeder. It ranks #1 among butterflies recorded in the state in our data.
Danaus plexippus
Monarch in Connecticut 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 Connecticut in August
Eastern Tiger Swallowtail
Zabulon Skipper
Spicebush Swallowtail
Peck's Skipper
Silver-spotted Skipper
Red-banded Hairstreak
Small White
Huron Skipper
Places to look in Connecticut
Botanical GardenConnecticut College Arboretum
Botanical GardenMarsh Botanical Garden
State ParkGillette Castle State Park
State ParkHammonasset Beach State Park
State ParkBigelow Hollow State Park
State ParkDinosaur State Park and Arboretum
FAQ
When does Monarch appear in Connecticut?
Mainly July–September, with the most records in August.
How common is Monarch in Connecticut?
It ranks #1 by number of iNaturalist observations among butterflies in Connecticut (4,442 records in our sample).