BirdAnalyst
Species · BCR 23 · BBS 2025 Release · 1966–2024

Warbling Vireo In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionForest birds

Warbling Vireo in Prairie Hardwood Transition has edged up: up 15% on the route-weighted index since 1968.

+15%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 →
159Routes 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 →
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 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 stay roughly flat through 2029, near 4.9 (95% range 3.8–6.0). A 5-year backtest shows a typical error of ±17.6%, with 40% of held-out values landing inside the 95% band.

-2%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 →
4.9Projected 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 →
3.8–6.095% 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 →
±17.6%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 stay roughly flat through 2029, near 4.9 (95% range 3.8–6.0). A 5-year backtest shows a typical error of ±17.6%, with 40% 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 →
20254.93.86.0
20264.93.86.0
20274.93.86.0
20284.93.86.0
20294.93.86.0

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 →
GrimmsWISCONSIN192021
GuilfordILLINOIS162023
ViroquaWISCONSIN162024
TrempealeauWISCONSIN152024
CoopersvilleMICHIGAN142024
Fall RiverWISCONSIN142024
RichmondMICHIGAN132024
StratfordWISCONSIN132024
AnnatonWISCONSIN132024
ParisWISCONSIN122024
BriggsvilleWISCONSIN122024
GalesburgMICHIGAN112024
PrattvilleMICHIGAN112021
AdairMICHIGAN111995
Chippewa Lk.MICHIGAN112024
Chatfield 2MINNESOTA112024
Newburg CrnsWISCONSIN112023
KendallWISCONSIN112023
WiotaWISCONSIN112024
Prairie Du ChienWISCONSIN112024
New BuffaloMICHIGAN102014
BismarkOHIO101995
EdenWISCONSIN102024
Hazel GreenWISCONSIN102024
BeloitWISCONSIN102024

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