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Species · Indiana · BBS 2026 Release · 1966–2025

Rose-breasted Grosbeak Population Trend in Indiana

All statesForest birds

Rose-breasted Grosbeak in Indiana has surged: up 488% on the route-weighted index since 1970.

+488%Since 1970TrendPercent 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 →
54Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Rose-breasted Grosbeak 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 →

Rose-breasted Grosbeak has surged in Indiana: up 488% on the route-weighted index since 1970.

Rose-breasted Grosbeak Population Forecast in Indiana

If the recent trend holds, Rose-breasted Grosbeak in Indiana is projected to stay roughly flat through 2030, near 0.76 (95% range 0.35–1.2). A 5-year backtest shows a typical error of ±82.3%, with 60% of held-out values landing inside the 95% band.

+6%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 →
0.76Projected 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 →
0.35–1.295% 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 →
±82.3%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, Rose-breasted Grosbeak in Indiana is projected to stay roughly flat through 2030, near 0.76 (95% range 0.35–1.2). A 5-year backtest shows a typical error of ±82.3%, with 60% 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 →
20260.740.331.1
20270.740.331.2
20280.750.341.2
20290.760.351.2
20300.760.351.2

Rose-breasted Grosbeak Survey Routes in Indiana

Routes recording Rose-breasted Grosbeak 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 →
Knox820251981
Lagrange620252000
Jamestown520241988
Middlebury420251992
Packertown420041973
Portage 2420252006
Berne320231981
Wallace320242000
Packertown 2320252005
Kewanna220211981
Fowler220211970
Spencer220161979
Washington220252025
Clear Spring220232017
Frankfort220212001
Kankakee Sands220252000
Lakeville220241996
Gary119911981
Hebron120251970
South Bend119901968
Columbia Cty120131985
Ellis120241966
W Lafayette120211988
Monticello120231981
Galveston120251981

Rose-breasted Grosbeak Population Trend in Other States

arkansasconnecticutgeorgiaillinoisiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-dakotatennesseevermontvirginiawest-virginiawisconsinwyoming

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