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Species · California · BBS 2025 Release · 1966–2024

California Gull Population Trend in California

All statesWetland birds

California Gull in California has increased: up 26% on the route-weighted index since 1973.

+26%Since 1973
58Routes In State
53Years

Notable California Gull Trends in California

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

California Gull Population Forecast in California

If the recent trend holds, California Gull in California is projected to rise about 206% by 2029 — from 0.63 in 2024 to a central estimate of 1.9 (95% range 0.00–5.1). A 5-year backtest shows a typical error of ±2037.8%, with 80% of held-out values landing inside the 95% band.

+206%Change by 2029
1.9Projected 2029 index
0.00–5.195% range
±2037.8%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20252.00.005.2
20262.00.005.2
20272.00.005.2
20282.00.005.1
20291.90.005.1

California Gull Survey Routes in California

Routes recording California Gull in California.
Bridgeport24519771972
Iron Gate9320191988
Goumaz8020042004
Likely5820171973
Haiwee Res5020041993
Crowley Lake4520241972
Poway3719801977
Cedarville3219781975
Dorris3120191972
Honeydew1620171977
Tuolumne Grove1519791979
Bodie1420161982
Oneals1020091999
San Ysidro919901987
Westley820172017
Benton820241975
Pennington619951995
Davis Creek619851981
Fairfax620181978
Mt Shasta519931980
Carrizo Pln419781978
Macdoel320191972
Coyote320241975
Ingalls319991973
Ravendale319991973

California Gull Population Trend in Other States

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