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Species · BCR 10 · BBS 2025 Release · 1966–2024

Black-throated Gray Warbler In Northern Rockies

All regionsNorthern RockiesForest birds

Black-throated Gray Warbler in Northern Rockies has declined: down 25% on the route-weighted index since 1990.

-25%Since 1990TrendPercent 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 →
15Routes 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 →
29YearsYears 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 Black-throated Gray Warbler in Northern Rockies. See the full index history below.

Black-throated Gray Warbler In Northern Rockies Population Forecast

If the recent trend holds, Black-throated Gray Warbler in Northern Rockies is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±109.3%, with 40% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.0595% 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 →
±109.3%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, Black-throated Gray Warbler in Northern Rockies is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±109.3%, with 40% 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 →
20250.010.000.05
20260.010.000.05
20270.010.000.05
20280.010.000.05
20290.010.000.05

Routes In Northern Rockies

Routes recording Black-throated Gray 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 →
Browns ParkCOLORADO22024
AlbeeOREGON21968
MadrasOREGON22023
L Pend O NwrWASHINGTON21995
NowoodWYOMING21990
Rock SpringsWYOMING22015
MaybellCOLORADO12024
FloraOREGON11991
Mount VernonOREGON12011
Hash RockOREGON11988
Hells CanyonOREGON11996
BarnhouseOREGON12023
TwickenhamOREGON12024
E. Bear LakeUTAH12022
ChewelahWASHINGTON12007

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