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

Grasshopper Sparrow Population Trend in Wyoming

All statesGrassland birds

Grasshopper Sparrow in Wyoming has risen sharply: up 51% on the route-weighted index since 1971.

+51%Since 1971TrendPercent 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 →
80Routes 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 →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Grasshopper 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Grasshopper Sparrow has risen sharply in Wyoming: up 51% on the route-weighted index since 1971.

Grasshopper Sparrow Population Forecast in Wyoming

If the recent trend holds, Grasshopper Sparrow in Wyoming is projected to rise about 17% by 2030 — from 2.2 in 2025 to a central estimate of 2.6 (95% range 0.54–4.6). A 5-year backtest shows a typical error of ±71.2%, with 100% of held-out values landing inside the 95% band.

+17%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 →
2.6Projected 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 →
0.54–4.695% 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 →
±71.2%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, Grasshopper Sparrow in Wyoming is projected to rise about 17% by 2030 — from 2.2 in 2025 to a central estimate of 2.6 (95% range 0.54–4.6). A 5-year backtest shows a typical error of ±71.2%, 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 →
20262.50.424.5
20272.50.454.5
20282.50.484.6
20292.60.514.6
20302.60.544.6

Grasshopper Sparrow Survey Routes in Wyoming

Routes recording Grasshopper 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 →
Chugwater3620242011
Recluse3120251981
Gvnt Valley1820251992
Savageton1720252019
Dayton1620251984
Rozet1420251991
Meadowdale1320251989
Caballa Crk1220251992
Arvada920251995
Upton920251987
Nowood819901990
Bill820181992
Highlight820071989
Lusk820251984
Cheyenne820251983
Elk Horn720181992
Wyarno620181975
Harland Flat620251991
Welch620181996
Hampshire620221994
Cody520181990
Crazy Woman520242000
Ethete520021992
Worland520251992
Pine Tree519951980

Grasshopper Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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