BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Yellow Warbler In Great Basin

All regionsGreat BasinForest birds

Yellow Warbler in Great Basin has edged up: up 20% on the route-weighted index since 1970.

+20%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 →
205Routes In RegionSurvey 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 SignalsNotable 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 Great Basin. See the full index history below.

Yellow Warbler In Great Basin Population Forecast

If the recent trend holds, Yellow Warbler in Great Basin is projected to stay roughly flat through 2030, near 4.2 (95% range 2.9–5.5). A 5-year backtest shows a typical error of ±20.4%, with 100% of held-out values landing inside the 95% band.

+9%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 →
4.2Projected 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 →
2.9–5.595% 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 →
±20.4%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 Great Basin is projected to stay roughly flat through 2030, near 4.2 (95% range 2.9–5.5). A 5-year backtest shows a typical error of ±20.4%, 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 →
20264.22.95.5
20274.22.95.5
20284.22.95.5
20294.22.95.5
20304.22.95.5

Routes In Great Basin

Routes recording Yellow Warbler in Great Basin.
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 →
Hardware RanchUTAH802023
HyrumUTAH721979
Magic MtnIDAHO642025
Meadow VallyNEVADA542025
Ruby ValleyNEVADA522001
GiffordIDAHO492017
WaitsburgWASHINGTON362004
Fish LakeOREGON302025
AlmoIDAHO292025
Humboldt Nf 2NEVADA232025
TwispWASHINGTON232024
PendletonOREGON222025
Modoc Point 2OREGON222025
JarbidgeNEVADA212015
NighthawkWASHINGTON212025
Iron GateCALIFORNIA182019
JoelIDAHO182024
Humboldt NfNEVADA182019
NewcastleUTAH182025
Lake ChelanWASHINGTON182025
ArdenvoirWASHINGTON171987
LeavenworthWASHINGTON172024
IndexWASHINGTON161971
ImnahaOREGON152025
Modoc PointOREGON142018

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