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Species · Montana · BBS 2025 Release · 1966–2024

Plumbeous Vireo Population Trend in Montana

All statesForest birds

Plumbeous Vireo in Montana has fallen sharply: down 63% on the route-weighted index since 1984.

-63%Since 1984TrendPercent 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 →
17Routes 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 →
38YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Plumbeous Vireo Trends in MontanaNotable 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 Plumbeous Vireo in Montana. See the full index history below.

Plumbeous Vireo Population Forecast in Montana

If the recent trend holds, Plumbeous Vireo in Montana is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±253.1%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.00Projected 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 →
0.00–1.195% 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 →
±253.1%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, Plumbeous Vireo in Montana is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±253.1%, with 100% of held-out values landing inside the 95% band.19742029
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 →
20250.000.001.1
20260.000.001.1
20270.000.001.1
20280.000.001.1
20290.000.001.1

Plumbeous Vireo Survey Routes in Montana

Routes recording Plumbeous Vireo in Montana.
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 →
Glen15019911991
Red Rock519891988
Brandenberg220151994
Flatwillow 2120172017
Sula119971986
Chestnut120021985
Reed Point120181984
Laurel120181997
Miles City120232023
Bull Mtn.120012001
Polson120002000
Arlee120011998
Highwood119741974
Brusett119831983
Jordan120242024
Wise River119941993
Elliston119971989

Plumbeous Vireo Population Trend in Other States

arizonacaliforniacoloradoidahonebraskanevadanew-mexicosouth-dakotatexasutahwyoming

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