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

Song Sparrow Population Trend in Indiana

All statesGeneralists

Song Sparrow in Indiana has edged down: down 13% on the route-weighted index since 1968.

-13%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 →
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 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 20% by 2029 — from 34 in 2024 to a central estimate of 27 (95% range 15–40). A 5-year backtest shows a typical error of ±10.5%, with 100% of held-out values landing inside the 95% band.

-20%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 →
27Projected 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 →
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 →
±10.5%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, Song Sparrow in Indiana is projected to fall about 20% by 2029 — from 34 in 2024 to a central estimate of 27 (95% range 15–40). A 5-year backtest shows a typical error of ±10.5%, 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 →
2025281641
2026281640
2027281540
2028281540
2029271540

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 →
Celestine7020241979
Brookville6720241966
Lakeville6520241993
Milroy6220241966
Witts Station6020242000
Scottsburg5920241982
New Phila5520241982
Laporte5520241999
Wallace5320241999
Washington5220241987
Jamestown5120241986
Spencer4920241967
Brazil4620241966
Maplewood4620212000
Muncie4519971981
Montpelier4520242018
Friendswood4320241986
Evansville4320221966
New Castle4320242002
Columbia Cty4220241981
Thorntown4220241982
Tipton4119921966
Millersburg4120241981
New Brunswick4120242024
Newberry4120241999

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 2026-05-22.