BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Plumbeous Vireo Population Trend in Wyoming

All statesForest birds

Plumbeous Vireo in Wyoming has fallen sharply: down 64% on the route-weighted index since 1977.

-64%Since 1977TrendPercent 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 →
30Routes 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 →
48YearsYears 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 WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Plumbeous Vireo has fallen sharply in Wyoming: down 64% on the route-weighted index since 1977.

Plumbeous Vireo Population Forecast in Wyoming

If the recent trend holds, Plumbeous Vireo in Wyoming is projected to stay roughly flat through 2030, near 0.18 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±623.2%, with 80% of held-out values landing inside the 95% band.

n/aChange 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 →
0.18Projected 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 →
0.00–0.4195% 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 →
±623.2%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 Wyoming is projected to stay roughly flat through 2030, near 0.18 (95% range 0.00–0.41). A 5-year backtest shows a typical error of ±623.2%, with 80% of held-out values landing inside the 95% band.19752030
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 →
20260.180.000.41
20270.180.000.41
20280.180.000.41
20290.180.000.41
20300.180.000.41

Plumbeous Vireo Survey Routes in Wyoming

Routes recording Plumbeous Vireo in Wyoming.
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 →
Fox Park920011993
Moose419911991
Savery319951992
Ne Entrance219931992
Hunter Peak220041986
Moskee220011980
Moskee 2220212002
Cody120002000
Sundance120221975
Colter Bay119951995
Dubois120161987
Bill119991999
Brookhurst120191978
Seely 2120102006
Cumberland119881978
Gvnt Valley120221997
Buford120192019
Mammoth119891989
Crazy Woman120241987
Seely120001991
Alpine120011990
Big Sandy119891989
Fiddler Lk120152015
Sand Draw120152015
Lamont119911991

Plumbeous Vireo Population Trend in Other States

arizonacaliforniacoloradoidahomontananebraskanevadanew-mexicosouth-dakotatexasutah

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