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

Yellow-billed Magpie Population Trend in California

All statesGeneralists

Yellow-billed Magpie in California has declined: down 40% on the route-weighted index since 1970.

-40%Since 1970
49Routes In State
56Years

Notable Yellow-billed Magpie Trends in California

No notable trend signals for Yellow-billed Magpie in California. See the full index history below.

Yellow-billed Magpie Population Forecast in California

If the recent trend holds, Yellow-billed Magpie in California is projected to fall about 22% by 2029 — from 1.6 in 2024 to a central estimate of 1.2 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±25.3%, with 100% of held-out values landing inside the 95% band.

-22%Change by 2029
1.2Projected 2029 index
0.00–3.295% range
±25.3%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
20251.50.003.5
20261.40.003.4
20271.40.003.3
20281.30.003.3
20291.20.003.2

Yellow-billed Magpie Survey Routes in California

Routes recording Yellow-billed Magpie in California.
Collegeville4620041968
Atwater4020041971
Tres Pinos 23620112005
Athlone2120041972
Jackson2019921972
Hughson1920241968
Coyote1620241972
Greenfield1520241973
Adelaida1420241970
Lockwood1320241972
Collegeville 21320232007
Tres Pinos1120031968
Westley1120241972
Zamora1120241972
Creston1020241972
Redding919831972
Cordova819811971
Oroville820241972
Ora Loma819951973
Rumsey620081969
Tomhead620111998
Oneals620051972
Staten Is.620241994
Carmel Val620241973
Yolla Bolly520231974

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