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Species · Wyoming · BBS 2026 Release · 1966–2025

Yellow Warbler Population Trend in Wyoming

All statesForest birds

Yellow Warbler in Wyoming has risen sharply: up 53% on the route-weighted index since 1970.

+53%Since 1970TrendPercent 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 →
108Routes 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 Yellow Warbler 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 →

Yellow Warbler has risen sharply in Wyoming: up 53% on the route-weighted index since 1970.

Yellow Warbler Population Forecast in Wyoming

If the recent trend holds, Yellow Warbler in Wyoming is projected to rise about 11% by 2030 — from 6.1 in 2025 to a central estimate of 6.8 (95% range 4.3–9.3). A 5-year backtest shows a typical error of ±10%, with 100% of held-out values landing inside the 95% band.

+11%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 →
6.8Projected 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 →
4.3–9.395% 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 →
±10%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, Yellow Warbler in Wyoming is projected to rise about 11% by 2030 — from 6.1 in 2025 to a central estimate of 6.8 (95% range 4.3–9.3). A 5-year backtest shows a typical error of ±10%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20266.74.29.2
20276.74.29.2
20286.74.29.3
20296.84.39.3
20306.84.39.3

Yellow Warbler Survey Routes in Wyoming

Routes recording Yellow Warbler 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 →
Wilson7520251979
Alpine3620251979
Soda Lake2920251980
Riverside2720251968
Buckskin Mtn2720251980
Bill2519991974
Dayton2220251980
Green River2219841977
Meeteetse2120251991
Walcott2020251985
Moskee 22020212002
Seedskadee 22020242024
Mtn View1920241980
Cody1820251983
Moose1720251976
Moran1720162002
Midvale1620251975
Sybille Cyn1620251989
Fontenelle1520251982
Sundance1420251975
Dwyer1420251996
Mayoworth1420241982
Boulder1420251982
Colter Bay1319991968
Ethete1320251991

Yellow Warbler Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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