BirdAnalyst
Species · Oregon · BBS 2025 Release · 1966–2024

Lark Sparrow Population Trend in Oregon

All statesGrassland birds

Lark Sparrow in Oregon has held roughly steady: up 10% on the route-weighted index since 1970.

+10%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
73Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Lark Sparrow Trends in OregonNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

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

Lark Sparrow Population Forecast in Oregon

If the recent trend holds, Lark Sparrow in Oregon is projected to fall about 76% by 2029 — from 2.1 in 2024 to a central estimate of 0.52 (95% range 0.00–2.6). A 5-year backtest shows a typical error of ±93.3%, with 20% of held-out values landing inside the 95% band.

-76%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.52Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–2.695% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±93.3%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Lark Sparrow in Oregon is projected to fall about 76% by 2029 — from 2.1 in 2024 to a central estimate of 0.52 (95% range 0.00–2.6). A 5-year backtest shows a typical error of ±93.3%, with 20% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.670.002.7
20260.630.002.7
20270.590.002.7
20280.560.002.6
20290.520.002.6

Lark Sparrow Survey Routes in Oregon

Routes recording Lark Sparrow in Oregon.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Trout Creek5720211996
Alvord Lake5620241968
Catlow Rim1920241993
Sheaville1820242012
Harney Lake1520241993
Three Forks1420242003
Madras1220241997
Adrian1020211984
Twickenham1020242010
Warner Vally1020241993
Fish Lake820241972
Umatilla820231989
Princeton719851972
Crane720241994
Crowley620241984
Donnybrook519971997
Blitzen 2420211995
Buchanan420241972
Barnes Val419721972
Mount Vernon420241986
Clover Creek420211972
Monument420231993
Imnaha320051968
Willow Spg319711969
Emigrant Lake 2320212002

Lark Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckylouisianaminnesotamississippimissourimontananebraskanevadanew-mexiconorth-dakotaohiooklahomasouth-dakotatennesseetexasutahwashingtonwisconsinwyoming

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