BirdAnalyst
Species · Wyoming · BBS 2025 Release · 1966–2024

Yellow Warbler Population Trend in Wyoming

All statesForest birds

Yellow Warbler in Wyoming has increased: up 48% on the route-weighted index since 1970.

+48%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 →
56YearsYears 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 →

No notable trend signals for Yellow Warbler in Wyoming. See the full index history below.

Yellow Warbler Population Forecast in Wyoming

If the recent trend holds, Yellow Warbler in Wyoming is projected to stay roughly flat through 2029, near 6.8 (95% range 4.3–9.4). A 5-year backtest shows a typical error of ±12.1%, with 100% of held-out values landing inside the 95% band.

+1%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 →
6.8Projected 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 →
4.3–9.495% 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 →
±12.1%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 stay roughly flat through 2029, near 6.8 (95% range 4.3–9.4). A 5-year backtest shows a typical error of ±12.1%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20256.74.29.2
20266.74.29.3
20276.84.29.3
20286.84.39.3
20296.84.39.4

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 →
Wilson8220241979
Alpine3420241979
Meeteetse3120241991
Dayton3120241980
Soda Lake2620241980
Bill2519991974
Green River2219841977
Midvale2120241975
Riverside2120241968
Cody2020241983
Moskee 22020212002
Seedskadee 22020242024
Mtn View1920241980
Moose1720241976
Boulder1720241982
Moran1720162002
Fontenelle1620241982
Fox Park1620241993
Buckskin Mtn1520211980
Harmony1520231982
Moskee 31520242022
Mayoworth1420241982
Basin1320241972
Colter Bay1319991968
Otto1220241970

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 2026-05-22.