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

Bell's Sparrow In Coastal California

All regionsCoastal CaliforniaGeneralists

Bell's Sparrow in Coastal California has declined: down 44% on the route-weighted index since 1971.

-44%Since 1971
51Routes In Region
55Years

Notable Signals

No notable trend signals for Bell's Sparrow in Coastal California. See the full index history below.

Forecast

If the recent trend holds, Bell's Sparrow in Coastal California is projected to rise about 68% by 2029 — from 0.49 in 2024 to a central estimate of 0.82 (95% range 0.02–1.6). A 5-year backtest shows a typical error of ±71%, with 100% of held-out values landing inside the 95% band.

+68%Change by 2029
0.82Projected 2029 index
0.02–1.695% range
±71%Backtest error
19692029
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
20250.830.031.6
20260.830.021.6
20270.830.021.6
20280.820.021.6
20290.820.021.6

Routes In Coastal California

Routes recording Bell's Sparrow in Coastal California.
StonyfordCALIFORNIA112018
Lockwood ValCALIFORNIA102019
RumseyCALIFORNIA82008
Hough SpringsCALIFORNIA82007
Cuyamaca PkCALIFORNIA72024
TujungaCALIFORNIA62012
Oak GroveCALIFORNIA52024
Bartlett SpsCALIFORNIA42018
GreenfieldCALIFORNIA42024
WoodlandsCALIFORNIA42021
PowayCALIFORNIA31980
MaricopaCALIFORNIA32024
VentucopaCALIFORNIA32001
Carrizo PlnCALIFORNIA32023
ShafterCALIFORNIA31985
San Benito Mtn.CALIFORNIA32009
Big BearCALIFORNIA21981
FairfaxCALIFORNIA21981
Elsinore MtnCALIFORNIA22010
Green ValleyCALIFORNIA22023
Lake CachumaCALIFORNIA22003
CrestonCALIFORNIA21996
Lake Hemet 2CALIFORNIA22013
Cleveland NfCALIFORNIA22014
Angelus OaksCALIFORNIA22004

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