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

Yellow Warbler Population Trend in Idaho

All statesForest birds

Yellow Warbler in Idaho has increased: up 32% on the route-weighted index since 1970.

+32%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 →
57Routes 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 IdahoNotable 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 Idaho. See the full index history below.

Yellow Warbler Population Forecast in Idaho

If the recent trend holds, Yellow Warbler in Idaho is projected to stay roughly flat through 2029, near 9.5 (95% range 5.2–14). A 5-year backtest shows a typical error of ±14.4%, with 100% of held-out values landing inside the 95% band.

-2%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 →
9.5Projected 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 →
5.2–1495% 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 →
±14.4%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 Idaho is projected to stay roughly flat through 2029, near 9.5 (95% range 5.2–14). A 5-year backtest shows a typical error of ±14.4%, 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 →
20259.55.214
20269.55.214
20279.55.214
20289.55.214
20299.55.214

Yellow Warbler Survey Routes in Idaho

Routes recording Yellow Warbler in Idaho.
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 →
Magic Mtn6520241987
Challis5520241975
Gifford4920171971
Cascade4319841968
Cabarton4320231985
Centerville2620191972
Cobalt1920241989
Joel1820241989
Naples1720241972
Pierce1620071990
Featherville1320241989
Henry1219831973
Sunbeam1220191994
Almo1220231988
Coolin1020241986
N Fork Cda R1020191993
Rochat Divde1020231993
Squirrel920241971
Mivoden820231977
Cape Horn720241972
Pocatello720191979
Cedar Hill720241993
Ririe520231971
Hot Spring520121988
Sawtooth Cty520141988

Yellow Warbler Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.