BirdAnalyst
Species · BCR 23 · BBS 2026 Release · 1966–2025

Warbling Vireo In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionForest birds

Warbling Vireo in Prairie Hardwood Transition has edged up: up 19% on the route-weighted index since 1968.

+19%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 →
160Routes 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 Warbling Vireo in Prairie Hardwood Transition. See the full index history below.

Warbling Vireo In Prairie Hardwood Transition Population Forecast

If the recent trend holds, Warbling Vireo in Prairie Hardwood Transition is projected to fall about 20% by 2030 — from 6.3 in 2025 to a central estimate of 5.0 (95% range 3.9–6.2). A 5-year backtest shows a typical error of ±19.6%, with 20% of held-out values landing inside the 95% band.

-20%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 →
5.0Projected 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 →
3.9–6.295% 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 →
±19.6%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, Warbling Vireo in Prairie Hardwood Transition is projected to fall about 20% by 2030 — from 6.3 in 2025 to a central estimate of 5.0 (95% range 3.9–6.2). A 5-year backtest shows a typical error of ±19.6%, with 20% 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 →
20265.03.86.1
20275.03.86.2
20285.03.96.2
20295.03.96.2
20305.03.96.2

Routes In Prairie Hardwood Transition

Routes recording Warbling Vireo in Prairie 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 →
KendallWISCONSIN202025
CoopersvilleMICHIGAN192025
GrimmsWISCONSIN192021
PardeevilleWISCONSIN172025
GuilfordILLINOIS162023
ViroquaWISCONSIN162024
TrempealeauWISCONSIN142025
RichmondMICHIGAN132024
Chippewa Lk.MICHIGAN132025
Fall RiverWISCONSIN132025
Hazel GreenWISCONSIN132025
WiotaWISCONSIN132025
ParisWISCONSIN132025
Packertown 2INDIANA122025
EsdaileWISCONSIN122025
N FreedomWISCONSIN122025
Prairie Du ChienWISCONSIN122025
No BradleyMICHIGAN112025
PrattvilleMICHIGAN112021
AdairMICHIGAN111995
CohoctahMICHIGAN112025
Sherburne NrMINNESOTA112025
CochraneWISCONSIN112025
MiddleburyINDIANA102025
New BuffaloMICHIGAN102014

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