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

Scarlet Tanager Population Trend in Indiana

All statesGeneralists

Scarlet Tanager in Indiana has surged: up 96% on the route-weighted index since 1968.

+96%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 →
60Routes 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 Scarlet 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 →

long arc increasecomputed 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 →

Scarlet Tanager has surged in Indiana: up 96% on the route-weighted index since 1968.

Scarlet Tanager Population Forecast in Indiana

If the recent trend holds, Scarlet Tanager in Indiana is projected to rise about 58% by 2029 — from 1.3 in 2024 to a central estimate of 2.1 (95% range 0.55–3.6). A 5-year backtest shows a typical error of ±71.5%, with 100% of held-out values landing inside the 95% band.

+58%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 →
2.1Projected 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 →
0.55–3.695% 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 →
±71.5%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, Scarlet Tanager in Indiana is projected to rise about 58% by 2029 — from 1.3 in 2024 to a central estimate of 2.1 (95% range 0.55–3.6). A 5-year backtest shows a typical error of ±71.5%, 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 →
20252.00.503.5
20262.00.523.5
20272.00.533.6
20282.10.543.6
20292.10.553.6

Scarlet Tanager Survey Routes in Indiana

Routes recording Scarlet 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 →
Hoosier2420241990
Georgia1220241999
Clear Spring420241981
Packertown320041967
Belmont320241981
Corydon320241966
Vevay320241966
Wallace320242000
Witts Station320242001
Cross Plains320241999
South Bend219831966
Middletown220021978
Pimento220221985
Brazil220151976
Friendswood220241988
Azalia220221982
Cumback220191966
Millersburg220121982
Indian Spgs220241983
Celestine220241979
New Phila220241982
Evansville220081974
Gary119921984
Hebron120021966
Knox120121989

Scarlet Tanager Population Trend in Other States

alabamaarkansasconnecticutdelawaregeorgiaillinoisiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawest-virginiawisconsin

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