BirdAnalyst
Species · Idaho · BBS 2025 Release · 1966–2024

Warbling Vireo Population Trend in Idaho

All statesForest birds

Warbling Vireo in Idaho has surged: up 135% on the route-weighted index since 1972.

+135%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 →
54YearsYears 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 135% 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 stay roughly flat through 2029, near 9.2 (95% range 5.5–13). A 5-year backtest shows a typical error of ±25.3%, with 100% of held-out values landing inside the 95% band.

+5%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 →
9.2Projected 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 →
5.5–1395% 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 →
±25.3%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, Warbling Vireo in Idaho is projected to stay roughly flat through 2029, near 9.2 (95% range 5.5–13). A 5-year backtest shows a typical error of ±25.3%, with 100% 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 →
20258.85.112
20268.95.213
20279.05.313
20289.15.413
20299.25.513

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 →
Cascade4919841983
Rochat Divde3820231993
Challis3420241975
Cabarton3420231985
Cape Horn3220241972
N Fork Cda R3120191993
Squirrel2920241971
Mivoden2620231977
Marble Creek2320231988
Featherville2220241989
Magic Mtn1920241987
Pierce1920071992
Sunbeam1920191994
Centerville1820191972
Cobalt1820241989
Silver City1720241989
Sawtooth Cty1520141988
Sawtooth City 21220242015
Naples1120241972
Deep Creek1119851985
Leadore1120241974
Lolo Pass920191995
Coolin920241986
Avery720231979
Alturas719871968

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 2026-05-22.