Migration & timing
Cassin's Vireo in California
There aren't yet enough observations of Cassin's Vireo in California to describe its timing with confidence.
Sighting 2 observations in California
Check back as more observations come in, or explore Cassin's Vireo across North America.
Cassin's Vireo elsewhere
More birds in California
Data: iNaturalist research-grade observations (CC0 / CC-BY), via GBIF. Excludes eBird.