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

Warbling Vireo Population Trend in Ohio

All statesForest birds

Warbling Vireo in Ohio has held roughly steady: down 4% on the route-weighted index since 1968.

-4%Since 1968TrendPercent 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 →
88Routes 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 →
59YearsYears 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 OhioNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Warbling Vireo in Ohio. See the full index history below.

Warbling Vireo Population Forecast in Ohio

If the recent trend holds, Warbling Vireo in Ohio is projected to fall about 31% by 2030 — from 2.6 in 2025 to a central estimate of 1.8 (95% range 0.92–2.6). A 5-year backtest shows a typical error of ±23.9%, with 60% of held-out values landing inside the 95% band.

-31%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 →
1.8Projected 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 →
0.92–2.695% 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 →
±23.9%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 Ohio is projected to fall about 31% by 2030 — from 2.6 in 2025 to a central estimate of 1.8 (95% range 0.92–2.6). A 5-year backtest shows a typical error of ±23.9%, with 60% of held-out values landing inside the 95% band.19662030
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 →
20261.80.962.7
20271.80.952.7
20281.80.942.7
20291.80.932.6
20301.80.922.6

Warbling Vireo Survey Routes in Ohio

Routes recording Warbling Vireo in Ohio.
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 →
Bismark1019951967
Napoleon920251972
Wilmington919961966
Pittsfield820241992
Lockport720251967
West Elkton720121992
Vickery720251996
Botkins620181992
Adamsville619891971
Kunkle520251992
Kalida520251969
Troy519961966
Baxter Ridge520251998
Harveysburg519961966
Omega520241966
Bloomville420251994
Kingsway420251966
Graytown419841966
Middlefield420171967
Herner Crns420251979
Marion420231966
Lattasburg420251970
Smithfield420251972
Cumberland420171966
Valley City420251996

Warbling Vireo Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaoklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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