Based on 6,260 research-grade iNaturalist observations in California, Mournful Duskywing is most often recorded in August; in California it behaves like a summer visitor / breeder. It ranks #31 among butterflies recorded in the state in our data.
Erynnis tristis
Mournful Duskywing in California 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 California in August
Monarch
Fiery Skipper
Gray Hairstreak
Gulf Fritillary
Gray Buckeye
Small White
Woodland Skipper
Western Tiger Swallowtail
Places to look in California
Botanical GardenThe Huntington Library, Art Museum, and Botanical Gardens
State ParkHearst Castle
Botanical GardenSan Francisco Botanical Garden
State ParkAnza-Borrego Desert State Park
National ForestAngeles National Forest
National ForestSequoia National Forest
FAQ
When does Mournful Duskywing appear in California?
Mainly March–October, with the most records in August.
How common is Mournful Duskywing in California?
It ranks #31 by number of iNaturalist observations among butterflies in California (6,260 records in our sample).