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

Blue-winged Warbler Population Trend in Georgia

All statesForest birds

Blue-winged Warbler in Georgia has fallen sharply: down 72% on the route-weighted index since 1975.

-72%Since 1975TrendPercent 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 →
8Routes 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 →
27YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Blue-winged Warbler 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 →

Blue-winged Warbler has fallen sharply in Georgia: down 72% on the route-weighted index since 1975.

Blue-winged Warbler Population Forecast in Georgia

If the recent trend holds, Blue-winged Warbler in Georgia is projected to stay roughly flat through 2019, near 0.00 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±130.6%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2019TrendPercent 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 2019 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0495% 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 →
±130.6%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, Blue-winged Warbler in Georgia is projected to stay roughly flat through 2019, near 0.00 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±130.6%, with 100% of held-out values landing inside the 95% band.19702019
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 →
20150.000.000.04
20160.000.000.04
20170.000.000.04
20180.000.000.04
20190.000.000.04

Blue-winged Warbler Survey Routes in Georgia

Routes recording Blue-winged Warbler 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 →
Baxter220021975
Holly Sprs219781978
Bowdon119901990
Linwood120142014
Pleasant Hill120062006
Oakman119731970
Cartersville119771977
Baldwin119701970

Blue-winged Warbler Population Trend in Other States

alabamaarkansasconnecticutdelawareillinoisindianaiowakentuckymarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandtennesseevermontvirginiawest-virginiawisconsin

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