Based on 64,069 research-grade iNaturalist observations in California, California Scrub-Jay is most often recorded in April; in California it behaves like a year-round resident. It ranks #9 among birds recorded in the state in our data.
Aphelocoma californica
California Scrub-Jay 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

Mallard
House Finch
Anna's Hummingbird
Canada Goose

California Towhee

Mourning Dove

Red-tailed Hawk
Lesser Goldfinch
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 California Scrub-Jay appear in California?
Mainly March–February, with the most records in April.
How common is California Scrub-Jay in California?
It ranks #9 by number of iNaturalist observations among birds in California (64,069 records in our sample).