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Species · Kansas · BBS 2025 Release · 1966–2024

Warbling Vireo Population Trend in Kansas

All statesForest birds

Warbling Vireo in Kansas has surged: up 134% on the route-weighted index since 1969.

+134%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 →
63Routes 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 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 134% 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 34% by 2029 — from 2.1 in 2024 to a central estimate of 2.8 (95% range 2.0–3.7). A 5-year backtest shows a typical error of ±43%, with 40% of held-out values landing inside the 95% band.

+34%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 →
2.8Projected 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 →
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 →
±43%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 34% by 2029 — from 2.1 in 2024 to a central estimate of 2.8 (95% range 2.0–3.7). A 5-year backtest shows a typical error of ±43%, with 40% of held-out values landing inside the 95% band.19672029
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 →
20252.71.93.6
20262.81.93.6
20272.81.93.6
20282.81.93.7
20292.82.03.7

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 →
Logan1220221968
Hanover1120231969
Minneapolis920191967
Covert920241967
Kanopolis720241972
Solomon720191982
Beloit 2620182005
Berwet620242000
Buckeye520231967
Jewell520051998
Wellington420241968
Dalton420241968
Hollenberg420231969
Jamestown420242000
Damar420162000
Melrose320211967
Chapman319811967
Phillipsburg320221967
Pittsburg320212005
Hopewell320142001
Trading Post320242005
Lincolnville320242003
Susank320222000
Severance320242000
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 2026-05-22.