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

Lark Sparrow In Coastal California

All regionsCoastal CaliforniaGrassland birds

Lark Sparrow in Coastal California has declined: down 46% on the route-weighted index since 1970.

-46%Since 1970
103Routes In Region
56Years

Notable Signals

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

Forecast

If the recent trend holds, Lark Sparrow in Coastal California is projected to rise about 33% by 2029 — from 2.5 in 2024 to a central estimate of 3.3 (95% range 0.63–6.0). A 5-year backtest shows a typical error of ±64.3%, with 100% of held-out values landing inside the 95% band.

+33%Change by 2029
3.3Projected 2029 index
0.63–6.095% range
±64.3%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
20253.40.756.1
20263.40.726.0
20273.30.696.0
20283.30.666.0
20293.30.636.0

Routes In Coastal California

Routes recording Lark Sparrow in Coastal California.
VentucopaCALIFORNIA412002
White RiverCALIFORNIA341992
Yokohl ValCALIFORNIA211997
Red BluffCALIFORNIA192024
Yolla BollyCALIFORNIA182024
ShafterCALIFORNIA111989
Mt LagunaCALIFORNIA101987
OnoCALIFORNIA92012
MaricopaCALIFORNIA92024
SangerCALIFORNIA82024
JacksonCALIFORNIA81992
Tres Pinos 2CALIFORNIA82011
CordovaCALIFORNIA71979
TomheadCALIFORNIA72011
CoalingaCALIFORNIA62022
FallsvaleCALIFORNIA61980
AtwaterCALIFORNIA62012
TujungaCALIFORNIA52013
Mesa GrandeCALIFORNIA52024
ArvinCALIFORNIA52016
WestleyCALIFORNIA52024
AlamarCALIFORNIA52017
CaruthersCALIFORNIA41987
ParkfieldCALIFORNIA42024
OrlandCALIFORNIA42014

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