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Species · Kansas · BBS 2026 Release · 1966–2025

Warbling Vireo Population Trend in Kansas

All statesForest birds

Warbling Vireo in Kansas has surged: up 155% on the route-weighted index since 1969.

+155%Since 1969TrendPercent 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 →
64Routes 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 →
58YearsYears 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 KansasNotable 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 Kansas: up 155% on the route-weighted index since 1969.

Warbling Vireo Population Forecast in Kansas

If the recent trend holds, Warbling Vireo in Kansas is projected to rise about 20% by 2030 — from 2.4 in 2025 to a central estimate of 2.8 (95% range 2.0–3.7). A 5-year backtest shows a typical error of ±38.2%, with 40% of held-out values landing inside the 95% band.

+20%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 →
2.8Projected 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 →
2.0–3.795% 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 →
±38.2%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 Kansas is projected to rise about 20% by 2030 — from 2.4 in 2025 to a central estimate of 2.8 (95% range 2.0–3.7). A 5-year backtest shows a typical error of ±38.2%, with 40% of held-out values landing inside the 95% band.19672030
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 →
20262.71.93.6
20272.81.93.6
20282.81.93.6
20292.81.93.7
20302.82.03.7

Warbling Vireo Survey Routes in Kansas

Routes recording Warbling Vireo in Kansas.
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 →
Minneapolis920191967
Phillipsburg920251967
Hanover720251969
Hollenberg620251969
Beloit 2620182005
Trading Post620252005
Buckeye520231967
Kanopolis520251972
Covert520251967
Jewell520051998
Wellington420241968
Damar420162000
Melrose320211967
Jewell 2320252006
Chapman319811967
Albert320251972
Logan320251968
Pittsburg320212005
Berwet320252000
Hopewell320142001
Lincolnville320242003
Susank320222000
Severance320252000
Rock Creek 2320252022
St John220191971

Warbling Vireo Population Trend in Other States

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

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