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

Anna's Hummingbird Population Trend in Oregon

All statesGeneralists

Anna's Hummingbird in Oregon has surged: up 156% on the route-weighted index since 1991.

+156%Since 1991TrendPercent 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 →
33Routes 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 →
26YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Anna's Hummingbird Trends in OregonNotable 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 →

Anna's Hummingbird has surged in Oregon: up 156% on the route-weighted index since 1991.

Anna's Hummingbird Population Forecast in Oregon

If the recent trend holds, Anna's Hummingbird in Oregon is projected to rise about 13% by 2029 — from 0.21 in 2024 to a central estimate of 0.24 (95% range 0.08–0.40). A 5-year backtest shows a typical error of ±45.6%, with 60% of held-out values landing inside the 95% band.

+13%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 →
0.24Projected 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 →
0.08–0.4095% 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 →
±45.6%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 Oregon is projected to rise about 13% by 2029 — from 0.21 in 2024 to a central estimate of 0.24 (95% range 0.08–0.40). A 5-year backtest shows a typical error of ±45.6%, with 60% of held-out values landing inside the 95% band.19792029
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 →
20250.220.060.38
20260.230.070.39
20270.230.070.39
20280.240.080.40
20290.240.080.40

Anna's Hummingbird Survey Routes in Oregon

Routes recording Anna's Hummingbird in Oregon.
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 →
Wedderburn820242017
Winberry520231996
Derby419901990
Glasgow420232005
Adair320242013
Hazel Camp320221991
Mcminnville320192018
Tualatin220242006
Scappoose220222022
Dayton220241996
Secret Val220042004
Emigrant Lk220001990
Coquille220242010
Green220232023
Santiam120232017
Nicolai Mtn.120232023
Umpqua120211996
Days Creek120171979
Modoc Point120102010
Harlan 2120222022
Emigrant Lake 2120242011
Scio120242021
Garfield120222022
Mt Hood120222013
Elkton120222022

Anna's Hummingbird Population Trend in Other States

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