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

Song Sparrow Population Trend in Indiana

All statesForest birds

Song Sparrow in Indiana has edged down: down 11% on the route-weighted index since 1968.

-11%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 →
69Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Song 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 →

No notable trend signals for Song Sparrow in Indiana. See the full index history below.

Song Sparrow Population Forecast in Indiana

If the recent trend holds, Song Sparrow in Indiana is projected to fall about 12% by 2030 — from 31 in 2025 to a central estimate of 27 (95% range 15–40). A 5-year backtest shows a typical error of ±9.8%, with 100% of held-out values landing inside the 95% band.

-12%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 →
27Projected 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 →
15–4095% 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 →
±9.8%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, Song Sparrow in Indiana is projected to fall about 12% by 2030 — from 31 in 2025 to a central estimate of 27 (95% range 15–40). A 5-year backtest shows a typical error of ±9.8%, with 100% of held-out values landing inside the 95% band.19662030
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 →
2026281641
2027281640
2028281640
2029281540
2030271540

Song Sparrow Survey Routes in Indiana

Routes recording Song 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 →
Witts Station7520252000
Scottsburg7020251982
Brookville6720251966
Lakeville6520241993
Washington5820251987
Jamestown5620251986
Laporte5520241999
Brazil5420251966
Wallace5320241999
Anderson5120252000
Spencer4920241967
Celestine4820251979
New Brunswick4820252024
New Phila4720251982
Cuba4620252017
Maplewood4620212000
Muncie4519971981
Montpelier4520242018
Friendswood4320241986
Evansville4320221966
New Castle4320242002
Columbia Cty4220241981
Middletown4220251966
Tipton4119921966
Millersburg4120241981

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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