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

Baltimore Oriole Population Trend in Montana

All statesForest birds

Baltimore Oriole in Montana has increased: up 29% on the route-weighted index since 1980.

+29%Since 1980TrendPercent 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 →
25Routes 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 →
23YearsYears 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 MontanaNotable 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 Baltimore Oriole in Montana. See the full index history below.

Baltimore Oriole Population Forecast in Montana

If the recent trend holds, Baltimore Oriole in Montana is projected to fall about 41% by 2030 — from 0.11 in 2025 to a central estimate of 0.06 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±55.2%, with 40% of held-out values landing inside the 95% band.

-41%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 →
0.06Projected 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 →
0.00–0.1395% 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 →
±55.2%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, Baltimore Oriole in Montana is projected to fall about 41% by 2030 — from 0.11 in 2025 to a central estimate of 0.06 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±55.2%, with 40% of held-out values landing inside the 95% band.19782030
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 →
20260.060.000.13
20270.060.000.13
20280.060.000.13
20290.060.000.13
20300.060.000.13

Baltimore Oriole Survey Routes in Montana

Routes recording Baltimore Oriole in Montana.
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 →
Wolf Point320182016
Malta220062006
Glasgow220252021
Locate220142014
Heart Butte220252025
Chinook220252016
Saco220252016
Lambert220242021
Custer220192019
Harlem120092009
Oswego120231997
Redstone120252002
Highwood119981996
Roy119911991
Circle119891989
Savage120061978
Forsyth120212021
Laurel120041979
Powderville120222022
East Glacier Park120222022
Ester Lake120172016
Westby120162016
Dinosaurs H.M.120242024
Lindsay120192019
Miles City120182018

Baltimore Oriole Population Trend in Other States

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

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