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Species · Colorado · BBS 2025 Release · 1966–2024

Bullock's Oriole Population Trend in Colorado

All statesGeneralists

Bullock's Oriole in Colorado has surged: up 121% on the route-weighted index since 1970.

+121%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 →
119Routes 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 →
56YearsYears 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 121% 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 rise about 12% by 2029 — from 2.1 in 2024 to a central estimate of 2.3 (95% range 1.1–3.5). A 5-year backtest shows a typical error of ±33.7%, with 100% of held-out values landing inside the 95% band.

+12%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 →
2.3Projected 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 →
1.1–3.595% 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 →
±33.7%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 rise about 12% by 2029 — from 2.1 in 2024 to a central estimate of 2.3 (95% range 1.1–3.5). A 5-year backtest shows a typical error of ±33.7%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20252.31.13.5
20262.31.13.5
20272.31.13.5
20282.31.13.5
20292.31.13.5

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
Cortez1720081988
Doyle Bridge1619971992
Arsenal1620151991
Arsenal 21520242016
Campo1420191988
Neegrande1420241992
Falfa1320241971
Douglas Pass1220241982
Mica Butte1219871968
Walsenburg1220241994
Doyle Bridge 21220231998
Cortez 21220172009
Yampa1020231973
Harmony920241973
Kiowa820181968
Boyero820171979
Trinchera820221990
Cokedale820241995
Fruita720071988
De Beque720241992
Kirk720232022
Hudson620241988
Prospect Val620001992

Bullock's Oriole Population Trend in Other States

arizonacaliforniaidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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