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Species · California · BBS 2025 Release · 1966–2024

Tricolored Blackbird Population Trend in California

All statesGeneralists

Tricolored Blackbird in California has fallen sharply: down 58% on the route-weighted index since 1970.

-58%Since 1970
89Routes In State
56Years

Notable Tricolored Blackbird Trends in California

long arc declinecomputed index

Tricolored Blackbird has fallen sharply in California: down 58% on the route-weighted index since 1970.

Tricolored Blackbird Population Forecast in California

If the recent trend holds, Tricolored Blackbird in California is projected to fall about 10% by 2029 — from 5.6 in 2024 to a central estimate of 5.0 (95% range 0.00–30). A 5-year backtest shows a typical error of ±290.1%, with 100% of held-out values landing inside the 95% band.

-10%Change by 2029
5.0Projected 2029 index
0.00–3095% range
±290.1%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
20256.10.0031
20265.80.0031
20275.50.0031
20285.30.0030
20295.00.0030

Tricolored Blackbird Survey Routes in California

Routes recording Tricolored Blackbird in California.
Oneals529020111983
Riovista32620242010
Atwater23320121971
Dorris21520071972
Jacumba20019991994
Mark West14019921972
Greenfield11320241979
Moreno8620171972
Poloma8619951993
Oroville8020121972
Westley7020231974
Copperopolis7020221979
Gold Hill6519901990
Bakersfield6020191968
Oilfields5619761968
Ventucopa4520021981
Lockwood4520221973
Iron Gate4520111991
Yolla Bolly4320221976
Onyx4219981969
Athlone4120071972
Gazelle4020101988
South Lake4020062006
Redding3819751972
Shafter3719891971

Tricolored Blackbird Population Trend in Other States

oregonwashington

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