BirdAnalyst
Species · California · BBS 2025 Release · 1966–2024

Least Tern Population Trend in California

All statesWetland birds

Least Tern in California has increased: up 26% on the route-weighted index since 1974.

+26%Since 1974
5Routes In State
12Years

Notable Least Tern Trends in California

No notable trend signals for Least Tern in California. See the full index history below.

Least Tern Survey Routes in California

Routes recording Least Tern in California.
Jofegan 21820242024
Poway619801974
Cp. Pendleton519701970
San Ysidro319921973
Niland219821982

Least Tern Population Trend in Other States

alabamaarkansascoloradodelawarefloridageorgiaillinoiskansaskentuckylouisianamainemarylandmassachusettsmississippimissourinebraskanew-jerseynew-yorknorth-carolinaoklahomasouth-carolinatennesseetexasvirginia

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.