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

Song Sparrow Population Trend in Alabama

All statesForest birds

Song Sparrow in Alabama has surged: up 19× on the route-weighted index since 1971.

19×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 →
35Routes 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 →
52YearsYears 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 AlabamaNotable 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 Alabama. See the full index history below.

Song Sparrow Population Forecast in Alabama

If the recent trend holds, Song Sparrow in Alabama is projected to fall about 23% by 2030 — from 0.47 in 2025 to a central estimate of 0.36 (95% range 0.05–0.67). A 5-year backtest shows a typical error of ±54.3%, with 60% of held-out values landing inside the 95% band.

-23%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 →
0.36Projected 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 →
0.05–0.6795% 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 →
±54.3%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 Alabama is projected to fall about 23% by 2030 — from 0.47 in 2025 to a central estimate of 0.36 (95% range 0.05–0.67). A 5-year backtest shows a typical error of ±54.3%, with 60% of held-out values landing inside the 95% band.19672030
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 →
20260.350.040.66
20270.350.040.66
20280.350.040.67
20290.360.050.67
20300.360.050.67

Song Sparrow Survey Routes in Alabama

Routes recording Song Sparrow in Alabama.
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 →
Carter Grove1420232011
Guntersville820241980
St Florian720251987
Greensport620251996
Talladega520252017
Woodville420241994
Valhermoso Spg 2420142014
Wheeler Dam319941994
Riverside320131999
Hillsboro219841984
Swaim220251981
Pine Grove220251975
Mentone220231996
Brooksville219911984
Trade119671967
Summitt119701970
Valhermoso Spgs120101981
Dawson119971991
Millerville119971997
Sunny Eve120132012
Mt Olive119981998
Maytown120002000
Lanett119841982
Kymulga120052003
Borden Springs 2120242001

Song Sparrow Population Trend in Other States

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

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