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

Lark Sparrow Population Trend in Wyoming

All statesGrassland birds

Lark Sparrow in Wyoming has held roughly steady: down 3% on the route-weighted index since 1970.

-3%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 →
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 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 2029, near 3.9 (95% range 1.7–6.1). A 5-year backtest shows a typical error of ±37.4%, with 100% of held-out values landing inside the 95% band.

-8%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 →
3.9Projected 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 →
1.7–6.195% 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 →
±37.4%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 2029, near 3.9 (95% range 1.7–6.1). A 5-year backtest shows a typical error of ±37.4%, with 100% 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 →
20253.91.76.0
20263.91.76.0
20273.91.76.1
20283.91.76.1
20293.91.76.1

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
Newcastle4520091990
Tensleep3220241995
Gebo2320241980
Arvada2220241982
Schoonover2120241982
Seely2020001990
Redbird1719891968
Sybille Cyn1520241997
Basin1420241971
Highlight1320071980
Chugwater1320241979
Bucknum1220241996
Nowood1120241993
Lovell1120241989
Worland1120241992
Wamsutter1019951995
Seely 2920242001
Hampshire920241994
Patrick Draw 4920021992
Meadowdale820171983
Welch820191978
Otto720241970
Dubois720241987
Yoder720241968

Lark Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckylouisianaminnesotamississippimissourimontananebraskanevadanew-mexiconorth-dakotaohiooklahomaoregonsouth-dakotatennesseetexasutahwashingtonwisconsin

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