Based on 6,740 research-grade iNaturalist observations in California, Common Ringlet is most often recorded in April; in California it behaves like a seasonal. It ranks #28 among butterflies recorded in the state in our data.
Coenonympha california
Common Ringlet 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 April

Monarch

Painted Lady

Variable Checkerspot
Mourning Cloak

Gray Buckeye
Umber Skipper

Anise Swallowtail

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
Anza-Borrego Desert State Park
Angeles National Forest
National ForestSequoia National Forest
FAQ
When does Common Ringlet appear in California?
Mainly March–June, with the most records in April.
How common is Common Ringlet in California?
It ranks #28 by number of iNaturalist observations among butterflies in California (6,740 records in our sample).