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

Red-eyed Vireo Population Trend in Wyoming

All statesForest birds

Red-eyed Vireo in Wyoming has risen sharply: up 59% on the route-weighted index since 1977.

+59%Since 1977TrendPercent 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 →
15Routes 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 →
48YearsYears 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 WyomingNotable 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 risen sharply in Wyoming: up 59% on the route-weighted index since 1977.

Red-eyed Vireo Population Forecast in Wyoming

If the recent trend holds, Red-eyed Vireo in Wyoming is projected to fall about 26% by 2030 — from 0.17 in 2025 to a central estimate of 0.13 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±26.7%, with 100% of held-out values landing inside the 95% band.

-26%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 →
0.13Projected 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 →
0.00–0.5395% 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 →
±26.7%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 Wyoming is projected to fall about 26% by 2030 — from 0.17 in 2025 to a central estimate of 0.13 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±26.7%, with 100% of held-out values landing inside the 95% band.19752030
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 →
20260.140.000.55
20270.140.000.54
20280.130.000.54
20290.130.000.53
20300.130.000.53

Red-eyed Vireo Survey Routes in Wyoming

Routes recording Red-eyed Vireo in Wyoming.
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 →
Moskee 31120252022
Fletcher Pk1119861982
Sundance520251975
Moskee420011980
Hunter Peak320101986
Alpine319801980
Moskee 2220212002
Clark120052001
Moose120222021
Dayton119841984
Crazy Woman119921979
Seely120001992
Seely 2120222007
Lingle119821982
Mammoth120002000

Red-eyed Vireo Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsin

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