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Species · Colorado · BBS 2025 Release · 1966–2024

Plumbeous Vireo Population Trend in Colorado

All statesForest birds

Plumbeous Vireo in Colorado has increased: up 41% on the route-weighted index since 1971.

+41%Since 1971TrendPercent 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 →
79Routes 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 →
55YearsYears 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 ColoradoNotable 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 Colorado. See the full index history below.

Plumbeous Vireo Population Forecast in Colorado

If the recent trend holds, Plumbeous Vireo in Colorado is projected to rise about 30% by 2029 — from 1.3 in 2024 to a central estimate of 1.7 (95% range 1.0–2.4). A 5-year backtest shows a typical error of ±30.9%, with 100% of held-out values landing inside the 95% band.

+30%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 →
1.7Projected 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 →
1.0–2.495% 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 →
±30.9%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 Colorado is projected to rise about 30% by 2029 — from 1.3 in 2024 to a central estimate of 1.7 (95% range 1.0–2.4). A 5-year backtest shows a typical error of ±30.9%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20251.60.962.3
20261.70.982.3
20271.71.002.3
20281.71.02.4
20291.71.02.4

Plumbeous Vireo Survey Routes in Colorado

Routes recording Plumbeous Vireo in Colorado.
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 →
Cokedale3120241995
Ludlow2120161998
Walsenburg1420241994
Douglas Pass1120241985
Baxter Pass920241994
Gribbles Prk920241994
Mesaverde Np920241996
Rifle Falls720191998
Pagosa Spgs619781969
Angora620241998
Wray Gulch520221988
Wet Mtns.420241993
Dinosaur420241995
Nucla420241999
Cortez 2420172009
Cheesman Lk320241969
Cortez320081991
Piedra320241992
Comanche Pk320222003
Powderhorn320232004
Gold Hill320121998
Westcliffe320241999
Haycamp Mesa320241998
Dolores219871969
Dolores Riv220191992

Plumbeous Vireo Population Trend in Other States

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