BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Lark Sparrow In Sierra Nevada

All regionsSierra NevadaGrassland birds

Lark Sparrow in Sierra Nevada has collapsed: down 76% on the route-weighted index since 1973.

-76%Since 1973
18Routes In Region
46Years

Notable Signals

long arc declinecomputed index

Lark Sparrow has collapsed in Sierra Nevada: down 76% on the route-weighted index since 1973.

Forecast

If the recent trend holds, Lark Sparrow in Sierra Nevada is projected to fall about 100% by 2029 — from 0.21 in 2024 to a central estimate of 0.00 (95% range 0.00–0.59). A 5-year backtest shows a typical error of ±146.1%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–0.5995% range
±146.1%Backtest error
19712029
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
20250.000.000.59
20260.000.000.59
20270.000.000.59
20280.000.000.59
20290.000.000.59

Routes In Sierra Nevada

Routes recording Lark Sparrow in Sierra Nevada.
LumberyardCALIFORNIA71988
SattleyCALIFORNIA72012
Silver CityCALIFORNIA42004
Kings CanyonCALIFORNIA31984
Higgins CornCALIFORNIA32002
Last ChanceCALIFORNIA32019
Eagle LakeCALIFORNIA21979
Cottage SpgsCALIFORNIA21975
Greenhorn MtCALIFORNIA22008
GeneseeCALIFORNIA21979
Pollock PinesCALIFORNIA22024
Bass LakeCALIFORNIA12008
Tuolumne GroveCALIFORNIA12018
RivertonCALIFORNIA12017
PlacervilleCALIFORNIA12024
CoultervilleCALIFORNIA12018
WawonaCALIFORNIA12024
Pine MountainCALIFORNIA12016

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