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

Chipping Sparrow In Coastal California

All regionsCoastal CaliforniaGeneralists

Chipping Sparrow in Coastal California has fallen sharply: down 74% on the route-weighted index since 1970.

-74%Since 1970
77Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Chipping Sparrow has fallen sharply in Coastal California: down 74% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Chipping Sparrow in Coastal California is projected to fall about 51% by 2029 — from 0.47 in 2024 to a central estimate of 0.23 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±30.5%, with 100% of held-out values landing inside the 95% band.

-51%Change by 2029
0.23Projected 2029 index
0.00–1.695% range
±30.5%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
20250.380.001.8
20260.340.001.8
20270.300.001.7
20280.270.001.7
20290.230.001.6

Routes In Coastal California

Routes recording Chipping Sparrow in Coastal California.
Santa Cruz ICALIFORNIA571988
S CatalinaCALIFORNIA262022
White RiverCALIFORNIA101992
Big BearCALIFORNIA81986
WoodlandsCALIFORNIA82024
Carmel ValCALIFORNIA72024
Cp. PendletonCALIFORNIA72004
CohassetCALIFORNIA62021
San Benito Mtn.CALIFORNIA62005
CalpellaCALIFORNIA51982
Tres PinosCALIFORNIA51994
AthloneCALIFORNIA51977
Cleveland NfCALIFORNIA51995
StonyfordCALIFORNIA52018
Mt LagunaCALIFORNIA41987
JofeganCALIFORNIA42018
Mt PinosCALIFORNIA32004
Oak GroveCALIFORNIA32003
El ToroCALIFORNIA31977
Lockwood ValCALIFORNIA32017
Green ValleyCALIFORNIA32023
Gold HillCALIFORNIA32023
TehamaCALIFORNIA32019
Yokohl ValCALIFORNIA21997
Santa YnezCALIFORNIA22002

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