Butterfly flight seasons in Colorado from 67,615 research-grade iNaturalist observations. July has the most activity.
By month
Colorado butterfly calendar (top 40)
Fewer More observations (relative to each row's peak month)
Activity by month (all species)
Most-photographed butterflies in Colorado
Painted Lady
Monarch
Two-tailed Swallowtail
Common Checkered-Skipper
Weidemeyer's Admiral
Small White
Variegated Fritillary
Rocky Mountain Parnassian
Mourning Cloak
Western Tiger Swallowtail
Taxiles Skipper
Checkered White
Hoary Comma
Gray Hairstreak
Red Admiral
Orange Sulphur
