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

Fox Sparrow In Coastal California

All regionsCoastal CaliforniaGeneralists

Fox Sparrow in Coastal California has collapsed: down 83% on the route-weighted index since 1971.

-83%Since 1971
27Routes In Region
54Years

Notable Signals

long arc declinecomputed index

Fox Sparrow has collapsed in Coastal California: down 83% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Fox Sparrow in Coastal California is projected to rise about 39% by 2028 — from 0.09 in 2023 to a central estimate of 0.12 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±93.3%, with 100% of held-out values landing inside the 95% band.

+39%Change by 2028
0.12Projected 2028 index
0.00–1.295% range
±93.3%Backtest error
19692028
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
20240.200.001.2
20250.180.001.2
20260.160.001.2
20270.140.001.2
20280.120.001.2

Routes In Coastal California

Routes recording Fox Sparrow in Coastal California.
ValyermoCALIFORNIA162019
Mt PinosCALIFORNIA82004
Lake HemetCALIFORNIA61986
Morro BayCALIFORNIA31974
Yolla BollyCALIFORNIA31973
Big BearCALIFORNIA21986
Green ValleyCALIFORNIA22023
Mt Pinos 2CALIFORNIA22021
TehamaCALIFORNIA21990
Cleveland NfCALIFORNIA22000
WoodlandsCALIFORNIA22023
Red BluffCALIFORNIA11986
Lake SuccessCALIFORNIA11978
CohassetCALIFORNIA12011
Sawmill MtnCALIFORNIA11974
TujungaCALIFORNIA11975
SisquocCALIFORNIA11987
Lockwood ValCALIFORNIA11988
Cp. PendletonCALIFORNIA11970
CrestonCALIFORNIA11999
White RiverCALIFORNIA11992
Gold HillCALIFORNIA11984
MoragaCALIFORNIA11988
Angelus OaksCALIFORNIA11993
Cal Hot SpgsCALIFORNIA12013

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