BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Baltimore Oriole Population Trend in Colorado

All statesGeneralists

Baltimore Oriole in Colorado has fallen sharply: down 74% on the route-weighted index since 1979.

-74%Since 1979TrendPercent 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 →
7Routes 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 →
19YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Baltimore 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 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 →

Baltimore Oriole has fallen sharply in Colorado: down 74% on the route-weighted index since 1979.

Baltimore Oriole Population Forecast in Colorado

If the recent trend holds, Baltimore Oriole in Colorado is projected to stay roughly flat through 2026, near 0.00 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±161.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2026TrendPercent 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 2026 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0795% 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 →
±161.3%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, Baltimore Oriole in Colorado is projected to stay roughly flat through 2026, near 0.00 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±161.3%, with 100% of held-out values landing inside the 95% band.19732026
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 →
20220.000.000.07
20230.000.000.07
20240.000.000.07
20250.000.000.07
20260.000.000.07

Baltimore Oriole Survey Routes in Colorado

Routes recording Baltimore 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 →
Amherst320212008
Pinneo219791979
Julesburg120212002
Lamar119811978
Villegreen119961996
Burlington120042004
Two Buttes119901973

Baltimore Oriole Population Trend in Other States

alabamaarkansascaliforniaconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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