BirdAnalyst
Species · BCR 5 · BBS 2025 Release · 1966–2024

Warbling Vireo In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestForest birds

Warbling Vireo in Northern Pacific Rainforest has edged up: up 13% on the route-weighted index since 1970.

+13%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 →
137Routes 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 →
56YearsYears 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 Warbling Vireo in Northern Pacific Rainforest. See the full index history below.

Warbling Vireo In Northern Pacific Rainforest Population Forecast

If the recent trend holds, Warbling Vireo in Northern Pacific Rainforest is projected to fall about 13% by 2029 — from 9.8 in 2024 to a central estimate of 8.5 (95% range 5.9–11). A 5-year backtest shows a typical error of ±22.7%, with 60% of held-out values landing inside the 95% band.

-13%Change 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 →
8.5Projected 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 →
5.9–1195% 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 →
±22.7%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, Warbling Vireo in Northern Pacific Rainforest is projected to fall about 13% by 2029 — from 9.8 in 2024 to a central estimate of 8.5 (95% range 5.9–11). A 5-year backtest shows a typical error of ±22.7%, with 60% 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 →
20258.45.711
20268.45.811
20278.55.811
20288.55.811
20298.55.911

Routes In Northern Pacific Rainforest

Routes recording Warbling Vireo in Northern Pacific Rainforest.
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 →
CougarWASHINGTON882023
MontesandWASHINGTON572024
LoraneOREGON522024
FisherOREGON462010
Harlan 2OREGON442024
KamilcheWASHINGTON362024
HoneydewCALIFORNIA342017
Klickitat MtOREGON331996
SaladoOREGON322024
Pe EllWASHINGTON292023
TimberOREGON282017
Nicolai Mtn.OREGON272024
Cedar FallsWASHINGTON272014
RuchOREGON262023
MolallaOREGON262024
WaldportOREGON242001
Mendota 3WASHINGTON242024
HarlanOREGON232009
CoquilleOREGON222024
ElktonOREGON212024
Raymond 2WASHINGTON212024
HolmesCALIFORNIA202024
Riley PeakOREGON202016
GreenwaterWASHINGTON202024
SvensenOREGON191992

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