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Species · Idaho · BBS 2026 Release · 1966–2025

Warbling Vireo Population Trend in Idaho

All statesForest birds

Warbling Vireo in Idaho has surged: up 165% on the route-weighted index since 1972.

+165%Since 1972TrendPercent 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 →
56Routes 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 →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Warbling Vireo Trends in IdahoNotable 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 increasecomputed 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 →

Warbling Vireo has surged in Idaho: up 165% on the route-weighted index since 1972.

Warbling Vireo Population Forecast in Idaho

If the recent trend holds, Warbling Vireo in Idaho is projected to fall about 22% by 2030 — from 12 in 2025 to a central estimate of 9.7 (95% range 6.0–14). A 5-year backtest shows a typical error of ±27.4%, with 80% of held-out values landing inside the 95% band.

-22%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 →
9.7Projected 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 →
6.0–1495% 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 →
±27.4%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 Idaho is projected to fall about 22% by 2030 — from 12 in 2025 to a central estimate of 9.7 (95% range 6.0–14). A 5-year backtest shows a typical error of ±27.4%, with 80% 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 →
20269.35.513
20279.45.613
20289.55.713
20299.65.813
20309.76.014

Warbling Vireo Survey Routes in Idaho

Routes recording Warbling Vireo in Idaho.
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 →
Challis5620251975
Cascade4919841983
Centerville3620251972
Sunbeam3520251994
Featherville3220251989
Cape Horn3120251972
N Fork Cda R3120191993
Cobalt3020251989
Magic Mtn2920251987
Cabarton2920241985
Rochat Divde2720251993
Naples2220251972
Silver City2020251989
Coolin1920251986
Marble Creek1920251988
Pierce1920071992
Burgdorf1820251988
Sawtooth City 21520252015
Sawtooth Cty1520141988
Mivoden1220251977
Avery1120251979
Deep Creek1119851985
Leadore1120241974
Squirrel1120251971
Lolo Pass920191995

Warbling Vireo Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawareillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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