BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

Bullock's Oriole In Northern Rockies

All regionsNorthern RockiesForest birds

Bullock's Oriole in Northern Rockies has increased: up 39% on the route-weighted index since 1970.

+39%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 →
134Routes In RegionSurvey 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 SignalsNotable 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 Bullock's Oriole in Northern Rockies. See the full index history below.

Bullock's Oriole In Northern Rockies Population Forecast

If the recent trend holds, Bullock's Oriole in Northern Rockies is projected to fall about 34% by 2030 — from 1.3 in 2025 to a central estimate of 0.85 (95% range 0.29–1.4). A 5-year backtest shows a typical error of ±15.9%, with 100% of held-out values landing inside the 95% band.

-34%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 →
0.85Projected 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 →
0.29–1.495% 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 →
±15.9%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 Northern Rockies is projected to fall about 34% by 2030 — from 1.3 in 2025 to a central estimate of 0.85 (95% range 0.29–1.4). A 5-year backtest shows a typical error of ±15.9%, 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 →
20260.860.301.4
20270.850.301.4
20280.850.291.4
20290.850.291.4
20300.850.291.4

Routes In Northern Rockies

Routes recording Bullock's Oriole in Northern Rockies.
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 →
SpartaOREGON382025
BridgeportOREGON222025
TwickenhamOREGON222025
Clyde ParkMONTANA142025
Green RiverWYOMING111984
DonnybrookOREGON91997
CascadeIDAHO81983
EtheteWYOMING82025
BasinWYOMING72025
MaybellCOLORADO62025
LaurelMONTANA62022
NewbridgeOREGON62025
MidvaleWYOMING62025
LayCOLORADO52025
MadrasOREGON52025
NaplesIDAHO42025
CentervilleIDAHO42019
Crane CreekIDAHO42019
GlenMONTANA42025
Church HillMONTANA42025
Pryor Mtn.MONTANA42013
WoodruffUTAH42025
FrannieWYOMING42023
HarmonyWYOMING42022
PolsonMONTANA32024

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