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Species · Colorado · BBS 2026 Release · 1966–2025

Bullock's Oriole Population Trend in Colorado

All statesForest birds

Bullock's Oriole in Colorado has surged: up 140% on the route-weighted index since 1970.

+140%Since 1970TrendPercent 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 →
121Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bullock's Oriole 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 →

long arc increasecomputed 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 →

Bullock's Oriole has surged in Colorado: up 140% on the route-weighted index since 1970.

Bullock's Oriole Population Forecast in Colorado

If the recent trend holds, Bullock's Oriole in Colorado is projected to stay roughly flat through 2030, near 2.3 (95% range 1.1–3.5). A 5-year backtest shows a typical error of ±26.7%, with 100% of held-out values landing inside the 95% band.

-1%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 →
2.3Projected 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 →
1.1–3.595% 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 →
±26.7%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, Bullock's Oriole in Colorado is projected to stay roughly flat through 2030, near 2.3 (95% range 1.1–3.5). A 5-year backtest shows a typical error of ±26.7%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20262.31.13.5
20272.31.13.5
20282.31.13.5
20292.31.13.5
20302.31.13.5

Bullock's Oriole Survey Routes in Colorado

Routes recording Bullock's Oriole 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 →
Dolores2619871968
Crowley2420241989
Walsenburg2020251994
Cortez1720081988
Doyle Bridge1619971992
Arsenal1620151991
Falfa1420251971
Campo1420251988
Neegrande1320251992
Douglas Pass1220241982
Mica Butte1219871968
Arsenal 21220252016
Cortez 21220172009
Bennett1120251995
Yampa1020231973
Two Buttes1020251974
Cokedale920251995
Kiowa820181968
Boyero820171979
Fort Morgan820251996
Doyle Bridge 2820251998
Harmony720251973
Aspen720251992
Hudson720251988
Fruita720071988

Bullock's Oriole Population Trend in Other States

arizonacaliforniaidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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