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Species · California · BBS 2025 Release · 1966–2024

Cassin's Finch Population Trend in California

All statesGeneralists

Cassin's Finch in California has declined: down 50% on the route-weighted index since 1970.

-50%Since 1970
86Routes In State
56Years

Notable Cassin's Finch Trends in California

No notable trend signals for Cassin's Finch in California. See the full index history below.

Cassin's Finch Population Forecast in California

If the recent trend holds, Cassin's Finch in California is projected to rise about 214% by 2029 — from 0.39 in 2024 to a central estimate of 1.2 (95% range 0.00–2.7). A 5-year backtest shows a typical error of ±125.4%, with 100% of held-out values landing inside the 95% band.

+214%Change by 2029
1.2Projected 2029 index
0.00–2.795% range
±125.4%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
20251.20.002.8
20261.20.002.8
20271.20.002.8
20281.20.002.7
20291.20.002.7

Cassin's Finch Survey Routes in California

Routes recording Cassin's Finch in California.
Lockwood Val2820061984
Fallsvale1919751970
Macdoel1520191973
Crowder Flat1420192002
Valyermo1320191970
Green Valley1120191970
Cleveland Nf1120001996
Chilcoot1120241998
Fall River Mills1020072006
Goumaz1020111997
Last Chance1020191993
Big Bear919861969
Tahoe Nf919941993
Medicine Mtn.920212000
Mt Pinos 2820212005
Mt Shasta820191972
Dardanelle720191972
Little Truckee720231997
Crestview720241997
Lassen Park619891979
Mt Pinos620041969
Woodfords520241974
Kings Canyon519721972
Whiskeytown520062006
Pine Mountain520171999

Cassin's Finch Population Trend in Other States

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