BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Cassin's Finch In Coastal California

All regionsCoastal CaliforniaGeneralists

Cassin's Finch in Coastal California has collapsed: down 87% on the route-weighted index since 1971.

-87%Since 1971
18Routes In Region
50Years

Notable Signals

long arc declinecomputed index

Cassin's Finch has collapsed in Coastal California: down 87% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Cassin's Finch in Coastal California is projected to fall about 100% by 2026 — from 0.19 in 2021 to a central estimate of 0.00 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±229.4%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2026
0.00Projected 2026 index
0.00–3.295% range
±229.4%Backtest error
19692026
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
20220.000.003.2
20230.000.003.2
20240.000.003.2
20250.000.003.2
20260.000.003.2

Routes In Coastal California

Routes recording Cassin's Finch in Coastal California.
Lockwood ValCALIFORNIA282006
FallsvaleCALIFORNIA191975
ValyermoCALIFORNIA132019
Green ValleyCALIFORNIA112019
Cleveland NfCALIFORNIA112000
Big BearCALIFORNIA91986
Mt Pinos 2CALIFORNIA82021
Mt PinosCALIFORNIA62004
TujungaCALIFORNIA31987
Lake HemetCALIFORNIA31986
Angelus OaksCALIFORNIA32013
Cal Hot SpgsCALIFORNIA32010
Lake CachumaCALIFORNIA21983
Lake SuccessCALIFORNIA11973
Mt BaldyCALIFORNIA12014
TehamaCALIFORNIA11981
AlamarCALIFORNIA12009
Hough SpringsCALIFORNIA12002

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