BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Lark Sparrow Population Trend in Wyoming

All statesGrassland birds

Lark Sparrow in Wyoming has held roughly steady: down 6% on the route-weighted index since 1970.

-6%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 →
113Routes 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 →
57YearsYears 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 WyomingNotable 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 Wyoming. See the full index history below.

Lark Sparrow Population Forecast in Wyoming

If the recent trend holds, Lark Sparrow in Wyoming is projected to stay roughly flat through 2030, near 3.9 (95% range 1.7–6.0). A 5-year backtest shows a typical error of ±25.8%, with 100% of held-out values landing inside the 95% band.

+8%Change by 2030TrendPercent 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 →
3.9Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.7–6.095% 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 →
±25.8%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 Wyoming is projected to stay roughly flat through 2030, near 3.9 (95% range 1.7–6.0). A 5-year backtest shows a typical error of ±25.8%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20263.91.76.0
20273.91.76.0
20283.91.76.0
20293.91.76.0
20303.91.76.0

Lark Sparrow Survey Routes in Wyoming

Routes recording Lark Sparrow in Wyoming.
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 →
Lysite4720241989
Dwyer3120251992
Gebo2820251980
Tensleep2720251995
Sybille Cyn2520251997
Basin2320251971
Seely2020001990
Meadowdale1820251983
Redbird1719891968
Lovell1620251989
Highlight1320071980
Chugwater1320241979
Bucknum1220241996
Otto1020251970
Nowood1020251993
Schoonover1020251982
Worland1020251992
Sand Draw1020251993
Shawnee920251993
Hampshire920241994
Patrick Draw 4920021992
Sussex820251991
Welch820191978
Thunder Basin820252012
Yoder720241968

Lark Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckylouisianaminnesotamississippimissourimontananebraskanevadanew-mexiconorth-dakotaohiooklahomaoregonsouth-dakotatennesseetexasutahwashingtonwisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.