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

Summer Tanager Population Trend in Alabama

All statesGeneralists

Summer Tanager in Alabama has edged up: up 18% on the route-weighted index since 1968.

+18%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 →
107Routes 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 Summer Tanager 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 Summer Tanager in Alabama. See the full index history below.

Summer Tanager Population Forecast in Alabama

If the recent trend holds, Summer Tanager in Alabama is projected to fall about 23% by 2029 — from 8.5 in 2024 to a central estimate of 6.5 (95% range 5.0–8.1). A 5-year backtest shows a typical error of ±16.9%, with 60% of held-out values landing inside the 95% band.

-23%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 →
6.5Projected 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 →
5.0–8.195% 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 →
±16.9%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, Summer Tanager in Alabama is projected to fall about 23% by 2029 — from 8.5 in 2024 to a central estimate of 6.5 (95% range 5.0–8.1). A 5-year backtest shows a typical error of ±16.9%, with 60% 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 →
20256.54.98.0
20266.54.98.1
20276.54.98.1
20286.54.98.1
20296.55.08.1

Summer Tanager Survey Routes in Alabama

Routes recording Summer Tanager 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 →
Epes3020241980
Liberty City 22920242017
Holt2620241993
Liberty City2420111979
Borden Springs 22120242001
Wallsboro1920211966
Billingsley1720221966
Elkmont1720241990
Rock Chapel1620241995
St Florian1520241967
Warrior Std1520241966
Stevenson1520241996
Sprott-Cahaba Riv1520141999
Vernon1420221996
Swaim1320241966
Elamville1320241984
Greensport1220241966
Linden1220231968
Sprague1220241966
Lanett1220241966
Brundidge1220211966
Whitehall1220241983
Calebee1220241993
Courtland1220231997
Triana1220121999

Summer Tanager Population Trend in Other States

arizonaarkansascaliforniadelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmississippimissourinebraskanevadanew-jerseynew-mexiconorth-carolinaohiooklahomapennsylvaniasouth-carolinatennesseetexasutahvirginiawest-virginiawisconsin

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