BirdAnalyst
Species · North Dakota · BBS 2025 Release · 1966–2024

Red-eyed Vireo Population Trend in North Dakota

All statesForest birds

Red-eyed Vireo in North Dakota has surged: up 428% on the route-weighted index since 1969.

+428%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 →
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 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 428% 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 44% by 2029 — from 2.7 in 2024 to a central estimate of 3.9 (95% range 2.1–5.6). A 5-year backtest shows a typical error of ±50.6%, with 80% of held-out values landing inside the 95% band.

+44%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 →
3.9Projected 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 →
2.1–5.695% 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 →
±50.6%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 44% by 2029 — from 2.7 in 2024 to a central estimate of 3.9 (95% range 2.1–5.6). A 5-year backtest shows a typical error of ±50.6%, with 80% 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 →
20253.71.95.4
20263.72.05.5
20273.82.05.5
20283.82.15.6
20293.92.15.6

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 Mtns5920241980
Roosevelt Pk1420191982
Emerado620241973
Bentley620232007
Dunn Center420121973
Kempton320171979
Cooperstown320241969
Forman219771977
Wimbledon219901990
Bowesmont220141968
Rolla220081997
Abercrombie220111967
Gorham220171968
Golva220171980
Parshall220031984
Bowesmont 2220162015
Walcott120231971
Sydney119801980
Edgeley120112011
Lake George120161996
Danzig120011995
Horsehead Lk120181982
Buchanan120221976
Nash120171980
Lakota120021994

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 2026-05-22.