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

Red-eyed Vireo Population Trend in Washington

All statesForest birds

Red-eyed Vireo in Washington has collapsed: down 86% on the route-weighted index since 1970.

-86%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 →
61Routes 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 →
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 Red-eyed Vireo Trends in WashingtonNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Red-eyed Vireo has collapsed in Washington: down 86% on the route-weighted index since 1970.

Red-eyed Vireo Population Forecast in Washington

If the recent trend holds, Red-eyed Vireo in Washington is projected to fall about 100% by 2030 — from 1.5 in 2025 to a central estimate of 0.00 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±248.7%, with 60% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–2.595% 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 →
±248.7%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, Red-eyed Vireo in Washington is projected to fall about 100% by 2030 — from 1.5 in 2025 to a central estimate of 0.00 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±248.7%, with 60% 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 →
20260.000.002.5
20270.000.002.5
20280.000.002.5
20290.000.002.5
20300.000.002.5

Red-eyed Vireo Survey Routes in Washington

Routes recording Red-eyed Vireo in Washington.
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 →
Kendall1320251981
Cusick1220251982
Index1019711968
Carnation1020251988
Newhalem920251968
L. Wenatchee820251993
Issaquah719871969
Laurier620252000
Twisp420241969
Keller420071968
L Pend O Nwr420241995
Twin Lakes420251984
Concrete320252013
Ardenvoir219851984
Mendota 2219971990
Glacier220011976
Tonasket220101991
Wilbur219901985
Curlew220131993
Malden220222022
Suiattle Riv220192018
Mazama220191993
Northport220251996
Mukilteo220021993
Cloverland220102005

Red-eyed Vireo Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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