Based on 14,369 research-grade iNaturalist observations in California, California Sister is most often recorded in June; in California it behaves like a summer visitor / breeder. It ranks #14 among butterflies recorded in the state in our data.
Adelpha californica
California Sister 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 June
Monarch
Gray Buckeye
Western Tiger Swallowtail
Variable Checkerspot
Small White
Anise Swallowtail
Pale Swallowtail
Acmon Blue
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 California Sister appear in California?
Mainly April–October, with the most records in June.
How common is California Sister in California?
It ranks #14 by number of iNaturalist observations among butterflies in California (14,369 records in our sample).