BirdAnalyst
Species · North Dakota · BBS 2026 Release · 1966–2025

Red-eyed Vireo Population Trend in North Dakota

All statesForest birds

Red-eyed Vireo in North Dakota has surged: up 444% on the route-weighted index since 1969.

+444%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 →
46Routes 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 Red-eyed Vireo Trends in North DakotaNotable 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 →

Red-eyed Vireo has surged in North Dakota: up 444% on the route-weighted index since 1969.

Red-eyed Vireo Population Forecast in North Dakota

If the recent trend holds, Red-eyed Vireo in North Dakota is projected to rise about 19% by 2030 — from 3.3 in 2025 to a central estimate of 3.9 (95% range 2.1–5.6). A 5-year backtest shows a typical error of ±46.2%, with 80% of held-out values landing inside the 95% band.

+19%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 →
3.9Projected 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 →
2.1–5.695% 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 →
±46.2%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, Red-eyed Vireo in North Dakota is projected to rise about 19% by 2030 — from 3.3 in 2025 to a central estimate of 3.9 (95% range 2.1–5.6). A 5-year backtest shows a typical error of ±46.2%, with 80% 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 →
20263.71.95.4
20273.72.05.5
20283.82.05.5
20293.82.15.6
20303.92.15.6

Red-eyed Vireo Survey Routes in North Dakota

Routes recording Red-eyed Vireo in North Dakota.
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 →
Turtle Mtns6420251980
Roosevelt Pk1420191982
Cooperstown1020251969
Bentley620232007
Emerado520251973
Dunn Center420121973
Kempton320171979
Forman219771977
Lake George220231996
Wimbledon219901990
Bowesmont220141968
Rolla220081997
Regan220251975
Stanley220251967
Abercrombie220111967
Denbigh220251971
Gorham220171968
Golva220171980
Parshall220031984
Bowesmont 2220162015
Solen220252005
Walcott120231971
Sydney119801980
Edgeley120112011
Danzig120011995

Red-eyed Vireo Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsinwyoming

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