Based on 1,726 research-grade iNaturalist observations in Colorado, Mourning Cloak is most often recorded in April; in Colorado it behaves like a summer visitor / breeder. It ranks #9 among butterflies recorded in the state in our data.
Nymphalis antiopa
Mourning Cloak in Colorado 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 Colorado in April
Painted Lady
Small White
Hoary Comma
Western Pine Elfin
Milbert's Tortoiseshell
Gray Hairstreak
Anise Swallowtail
Common Checkered-Skipper
Places to look in Colorado
National ForestWhite River National Forest
Botanical GardenDenver Botanic Gardens
National ForestRio Grande National Forest
National ForestSan Juan National Forest
State ParkRoxborough State Park
State ParkMancos State Park
FAQ
When does Mourning Cloak appear in Colorado?
Mainly March–September, with the most records in April.
How common is Mourning Cloak in Colorado?
It ranks #9 by number of iNaturalist observations among butterflies in Colorado (1,726 records in our sample).