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

Song Sparrow In Coastal California

All regionsCoastal CaliforniaGeneralists

Song Sparrow in Coastal California has surged: up 135% on the route-weighted index since 1970.

+135%Since 1970
108Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Song Sparrow has surged in Coastal California: up 135% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Song Sparrow in Coastal California is projected to rise about 15% by 2029 — from 5.2 in 2024 to a central estimate of 6.0 (95% range 3.0–9.0). A 5-year backtest shows a typical error of ±44%, with 100% of held-out values landing inside the 95% band.

+15%Change by 2029
6.0Projected 2029 index
3.0–9.095% range
±44%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
20255.92.98.9
20265.92.99.0
20276.03.09.0
20286.03.09.0
20296.03.09.0

Routes In Coastal California

Routes recording Song Sparrow in Coastal California.
Point ReyesCALIFORNIA342023
Santa Cruz ICALIFORNIA301988
Ora LomaCALIFORNIA262024
Staten Is.CALIFORNIA262024
Harbor Lake 2CALIFORNIA242024
Cp. PendletonCALIFORNIA222004
ArvinCALIFORNIA202022
SisquocCALIFORNIA192014
PescaderoCALIFORNIA192024
PowayCALIFORNIA161980
Jofegan 2CALIFORNIA142024
El ToroCALIFORNIA131999
ColmaCALIFORNIA121972
FairfaxCALIFORNIA122024
RumseyCALIFORNIA112008
FallsvaleCALIFORNIA111981
GreenfieldCALIFORNIA112024
MorenoCALIFORNIA102024
Mark WestCALIFORNIA102024
Harbor LakeCALIFORNIA91991
Cuyamaca PkCALIFORNIA92024
LockwoodCALIFORNIA92024
HollisterCALIFORNIA82011
Lake BerryessaCALIFORNIA82024
Hollister 2CALIFORNIA82024

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