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

Yellow Warbler In Northern Rockies

All regionsNorthern RockiesForest birds

Yellow Warbler in Northern Rockies has edged up: up 24% on the route-weighted index since 1970.

+24%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 →
207Routes 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 Yellow Warbler in Northern Rockies. See the full index history below.

Yellow Warbler In Northern Rockies Population Forecast

If the recent trend holds, Yellow Warbler in Northern Rockies is projected to fall about 15% by 2030 — from 11 in 2025 to a central estimate of 9.1 (95% range 6.2–12). A 5-year backtest shows a typical error of ±16.1%, with 100% of held-out values landing inside the 95% band.

-15%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 →
9.1Projected 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 →
6.2–1295% 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 →
±16.1%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, Yellow Warbler in Northern Rockies is projected to fall about 15% by 2030 — from 11 in 2025 to a central estimate of 9.1 (95% range 6.2–12). A 5-year backtest shows a typical error of ±16.1%, 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 →
20269.16.212
20279.16.212
20289.16.212
20299.16.212
20309.16.212

Routes In Northern Rockies

Routes recording Yellow Warbler 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 →
WilsonWYOMING752025
CentervilleIDAHO732025
ChallisIDAHO592025
ChestnutMONTANA462025
Clyde ParkMONTANA462025
Spring LakeWASHINGTON462025
CascadeIDAHO431984
CabartonIDAHO392024
NaplesIDAHO382025
BridgeportOREGON362025
AlpineWYOMING362025
WoodruffUTAH322025
NinemileMONTANA312025
SunbeamIDAHO302025
ClancyMONTANA302025
Red RockMONTANA292025
Hells CanyonOREGON292025
Donelly 2OREGON292025
Soda LakeWYOMING292025
Fish CreekMONTANA282024
Hebgen LakeMONTANA272025
RiversideWYOMING272025
Buckskin MtnWYOMING272025
Church HillMONTANA252025
East Glacier ParkMONTANA242025

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