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

Summer Tanager Population Trend in Indiana

All statesForest birds

Summer Tanager in Indiana has increased: up 43% on the route-weighted index since 1968.

+43%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 →
36Routes 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 →
59YearsYears 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 IndianaNotable 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 Indiana. See the full index history below.

Summer Tanager Population Forecast in Indiana

If the recent trend holds, Summer Tanager in Indiana is projected to fall about 15% by 2030 — from 1.1 in 2025 to a central estimate of 0.96 (95% range 0.48–1.4). A 5-year backtest shows a typical error of ±21.2%, with 100% of held-out values landing inside the 95% band.

-15%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 →
0.96Projected 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 →
0.48–1.495% 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 →
±21.2%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 Indiana is projected to fall about 15% by 2030 — from 1.1 in 2025 to a central estimate of 0.96 (95% range 0.48–1.4). A 5-year backtest shows a typical error of ±21.2%, 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 →
20260.940.471.4
20270.950.471.4
20280.950.471.4
20290.950.481.4
20300.960.481.4

Summer Tanager Survey Routes in Indiana

Routes recording Summer Tanager in Indiana.
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 →
Georgia1020251999
Pimento820252003
Indian Spgs620251983
Celestine620251980
Corydon420251966
Azalia320251982
Clear Spring320251981
New Phila320251982
New Castle220172016
Cross Plains220251999
Hebron120021995
Knox120252025
Kewanna120132013
Hoosier120251990
Indiana Dune120082008
Kankakee Sands120052004
Fowler120122012
W Lafayette120142003
Galveston120102010
Brazil120251970
Belmont120211981
Spencer120161970
Sexton120241981
Milroy119921969
Brookville120251970

Summer Tanager Population Trend in Other States

alabamaarizonaarkansascaliforniadelawarefloridageorgiaillinoisiowakansaskentuckylouisianamarylandmississippimissourinebraskanevadanew-jerseynew-mexiconorth-carolinaohiooklahomapennsylvaniasouth-carolinatennesseetexasutahvirginiawest-virginiawisconsin

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