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Species · Indiana · BBS 2025 Release · 1966–2024

Grasshopper Sparrow Population Trend in Indiana

All statesGrassland birds

Grasshopper Sparrow in Indiana has collapsed: down 95% on the route-weighted index since 1968.

-95%Since 1968TrendPercent 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 →
60Routes 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 →
58YearsYears 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 IndianaNotable 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 declinecomputed 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 collapsed in Indiana: down 95% on the route-weighted index since 1968.

Grasshopper Sparrow Population Forecast in Indiana

If the recent trend holds, Grasshopper Sparrow in Indiana is projected to fall about 100% by 2029 — from 0.67 in 2024 to a central estimate of 0.00 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±199.5%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–3.595% 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 →
±199.5%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 Indiana is projected to fall about 100% by 2029 — from 0.67 in 2024 to a central estimate of 0.00 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±199.5%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.000.003.5
20260.000.003.5
20270.000.003.5
20280.000.003.5
20290.000.003.5

Grasshopper Sparrow Survey Routes in Indiana

Routes recording Grasshopper Sparrow in Indiana.
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 →
Kankakee Sands1720242000
Newberry920241999
Gary819841984
Thorntown420221983
Muncie319971996
Sexton320231983
Shelbyville320211985
Cumback320161966
Vevay320011966
Scottsburg320141982
Evansville320141966
Crown Point320011999
Lagrange320241999
Middlebury220191989
Columbia Cty220221985
Packertown220041967
Ellis220161966
Fowler220101966
Middletown220161966
Swayzee220141981
Jamestown220071986
Spencer220181967
Clear Spring220121982
Decatur220241999
New Castle220242002

Grasshopper Sparrow Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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