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Species · Georgia · BBS 2026 Release · 1966–2025

Grasshopper Sparrow Population Trend in Georgia

All statesGrassland birds

Grasshopper Sparrow in Georgia 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 →
43Routes 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 GeorgiaNotable 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 Georgia: down 95% on the route-weighted index since 1968.

Grasshopper Sparrow Population Forecast in Georgia

If the recent trend holds, Grasshopper Sparrow in Georgia is projected to fall about 100% by 2030 — from 0.23 in 2025 to a central estimate of 0.00 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±148.7%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–1.395% 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 →
±148.7%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 Georgia is projected to fall about 100% by 2030 — from 0.23 in 2025 to a central estimate of 0.00 (95% range 0.00–1.3). A 5-year backtest shows a typical error of ±148.7%, 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 →
20260.000.001.3
20270.000.001.3
20280.000.001.3
20290.000.001.3
20300.000.001.3

Grasshopper Sparrow Survey Routes in Georgia

Routes recording Grasshopper Sparrow in Georgia.
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 →
Wadley619791979
Lincolnton519951967
Stoney Point 2520192015
Rock Branch520252005
Lacross419921974
Metasville420001997
Linwood320181970
Holly Sprs319831978
Hiram319991986
Hawkinsville219841976
Maxeys220241966
Hollonville220031973
Athens220251966
Siloam220121967
Juliette219961978
Good Hope220252005
Sunny Side220182007
Forsyth120221973
Crest120021973
Oakman119811966
Cartersville120251980
Henderson120251976
Doles119881988
Baldwin120221967
Grovetown119941983

Grasshopper Sparrow Population Trend in Other States

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

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