Butterfly flight seasons in Massachusetts from 64,490 research-grade iNaturalist observations. July has the most activity.
By month
Massachusetts butterfly calendar (top 40)
Fewer More observations (relative to each row's peak month)
Activity by month (all species)
Most-photographed butterflies in Massachusetts
Monarch
Small White
American Copper
American Lady
Zabulon Skipper
Silver-spotted Skipper
Red Admiral
Spicebush Swallowtail
Peck's Skipper
Eastern Tiger Swallowtail
Pearl Crescent
Eastern Tailed-Blue
Red-spotted Admiral
Gray Hairstreak
Little Wood Satyr
Mourning Cloak
