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Species · Alabama · BBS 2025 Release · 1966–2024

Grasshopper Sparrow Population Trend in Alabama

All statesGrassland birds

Grasshopper Sparrow in Alabama has collapsed: down 87% on the route-weighted index since 1968.

-87%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 →
34Routes 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 →
57YearsYears 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 AlabamaNotable 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 Alabama: down 87% on the route-weighted index since 1968.

Grasshopper Sparrow Population Forecast in Alabama

If the recent trend holds, Grasshopper Sparrow in Alabama is projected to rise about 102% by 2029 — from 0.05 in 2024 to a central estimate of 0.11 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±256.9%, with 100% of held-out values landing inside the 95% band.

+102%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 →
0.11Projected 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 →
0.00–0.3695% 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 →
±256.9%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 Alabama is projected to rise about 102% by 2029 — from 0.05 in 2024 to a central estimate of 0.11 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±256.9%, 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 →
20250.120.000.37
20260.120.000.37
20270.110.000.37
20280.110.000.36
20290.110.000.36

Grasshopper Sparrow Survey Routes in Alabama

Routes recording Grasshopper 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 →
Courtland520061997
South320031967
Woodville320082008
Hillsboro219961977
Trade219731967
Valhermoso Spgs219841969
Cottonton219801967
Whitehouse220071990
Guntersville219891989
Whitehall219941991
Childersburg219991993
St Florian120101968
Swaim120171966
Pine Grove120191966
Dawson119881972
Millerville119691969
Dearmanville119791966
Sunny Eve119681968
Billingsley120052003
Lanett120232005
Kymulga120122000
Borden Springs 2120062001
Drummond120082007
Fairview119921992
Mentone120192012

Grasshopper Sparrow Population Trend in Other States

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

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