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Species · BCR 12 · BBS 2026 Release · 1966–2025

Indigo Bunting In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Indigo Bunting in Boreal Hardwood Transition has increased: up 33% on the route-weighted index since 1968.

+33%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 →
122Routes In RegionSurvey 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 SignalsNotable 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 Indigo Bunting in Boreal Hardwood Transition. See the full index history below.

Indigo Bunting In Boreal Hardwood Transition Population Forecast

If the recent trend holds, Indigo Bunting in Boreal Hardwood Transition is projected to fall about 27% by 2030 — from 11 in 2025 to a central estimate of 8.0 (95% range 4.4–12). A 5-year backtest shows a typical error of ±18.1%, with 100% of held-out values landing inside the 95% band.

-27%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 →
8.0Projected 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 →
4.4–1295% 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 →
±18.1%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, Indigo Bunting in Boreal Hardwood Transition is projected to fall about 27% by 2030 — from 11 in 2025 to a central estimate of 8.0 (95% range 4.4–12). A 5-year backtest shows a typical error of ±18.1%, 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 →
20268.04.412
20278.04.412
20288.04.412
20298.04.412
20308.04.412

Routes In Boreal Hardwood Transition

Routes recording Indigo Bunting in Boreal Hardwood Transition.
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 →
BashawWISCONSIN582025
WausaukeeWISCONSIN392025
Iron RiverWISCONSIN372025
RiggsvilleMICHIGAN332019
Walloon LakeMICHIGAN332004
BayfieldWISCONSIN332025
Pleasant Valley 2MICHIGAN312025
CunardMICHIGAN302021
PickfordMICHIGAN272025
Amnicon FallsWISCONSIN272025
Cedar RunMICHIGAN251999
Ned LakeMICHIGAN242025
Crystal FlsMICHIGAN232025
Walloon Lake 2MICHIGAN232024
IrmaWISCONSIN232025
Weirgor SpringsWISCONSIN222025
WilsonMICHIGAN212010
OntonagonMICHIGAN202019
HermanMICHIGAN202022
SkeelsMICHIGAN202015
Wigwam BayMINNESOTA182023
Union TwpWISCONSIN182025
Washington IWISCONSIN182025
Maple GroveMICHIGAN172025
CrandonWISCONSIN172025

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