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Species · California · BBS 2025 Release · 1966–2024

Glaucous-winged Gull Population Trend in California

All statesWetland birds

Glaucous-winged Gull in California has declined: down 26% on the route-weighted index since 1976.

-26%Since 1976
8Routes In State
25Years

Notable Glaucous-winged Gull Trends in California

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

Glaucous-winged Gull Population Forecast in California

If the recent trend holds, Glaucous-winged Gull in California is projected to stay roughly flat through 2024, near 0.02 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±285.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024
0.02Projected 2024 index
0.00–0.0895% range
±285.4%Backtest error
19732024
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
20200.020.000.09
20210.020.000.09
20220.020.000.09
20230.020.000.08
20240.020.000.08

Glaucous-winged Gull Survey Routes in California

Routes recording Glaucous-winged Gull in California.
Navarro1019951990
Point Reyes619931992
Crescent Cty320011977
Bodega Bay120191975
Honeydew120161975
Fish Rock120001980
Fairfax119801973
Laytonville119911981

Glaucous-winged Gull Population Trend in Other States

alaskaoregonwashington

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