BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Anna's Hummingbird In Great Basin

All regionsGreat BasinGeneralists

Anna's Hummingbird in Great Basin has increased: up 34% on the route-weighted index since 1984.

+34%Since 1984TrendPercent 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 →
20Routes 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 →
36YearsYears 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 Anna's Hummingbird in Great Basin. See the full index history below.

Anna's Hummingbird In Great Basin Population Forecast

If the recent trend holds, Anna's Hummingbird in Great Basin is projected to stay roughly flat through 2029, near 0.04 (95% range 0.01–0.07). A 5-year backtest shows a typical error of ±56.8%, with 60% of held-out values landing inside the 95% band.

n/aChange 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 →
0.04Projected 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 →
0.01–0.0795% 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 →
±56.8%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, Anna's Hummingbird in Great Basin is projected to stay roughly flat through 2029, near 0.04 (95% range 0.01–0.07). A 5-year backtest shows a typical error of ±56.8%, with 60% of held-out values landing inside the 95% band.19732029
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 →
20250.030.010.06
20260.040.010.06
20270.040.010.07
20280.040.010.07
20290.040.010.07

Routes In Great Basin

Routes recording Anna's Hummingbird 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 →
BartleCALIFORNIA32015
Iron GateCALIFORNIA32019
NubieberCALIFORNIA22018
DorrisCALIFORNIA21984
Clear Lk ResCALIFORNIA21993
ConcreteWASHINGTON22017
MacdoelCALIFORNIA12008
Deep SpringsCALIFORNIA12010
TionestaCALIFORNIA12006
Fall River MillsCALIFORNIA12010
Medicine Mtn.CALIFORNIA12006
Desert NwrNEVADA12014
Modoc PointOREGON12010
Mt HoodOREGON12022
Badger CreekOREGON12015
TwispWASHINGTON12024
SnowdenWASHINGTON12018
KendallWASHINGTON12024
YakimaWASHINGTON12021
Lake ChelanWASHINGTON12023

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