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Species · Washington · BBS 2026 Release · 1966–2025

Anna's Hummingbird Population Trend in Washington

All statesForest birds

Anna's Hummingbird in Washington has surged: up 11× on the route-weighted index since 2008.

11×Since 2008TrendPercent 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 →
22Routes 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 →
18YearsYears 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 WashingtonNotable 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 Washington. See the full index history below.

Anna's Hummingbird Population Forecast in Washington

If the recent trend holds, Anna's Hummingbird in Washington is projected to rise about 29% by 2030 — from 0.31 in 2025 to a central estimate of 0.40 (95% range 0.21–0.59). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.

+29%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 →
0.40Projected 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 →
0.21–0.5995% 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 →
±22.5%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 Washington is projected to rise about 29% by 2030 — from 0.31 in 2025 to a central estimate of 0.40 (95% range 0.21–0.59). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.19892030
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 →
20260.350.160.55
20270.370.170.56
20280.380.190.57
20290.390.200.58
20300.400.210.59

Anna's Hummingbird Survey Routes in Washington

Routes recording Anna's Hummingbird in Washington.
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 →
Warm Beach620172015
Everett420242014
Mukilteo420252013
Carnation420252008
Deception320182017
Raymond 2320222022
Warm Beach 2320242018
Port Angeles220252013
Ilwaco220251989
Hurricane Rg220172017
Concrete220172017
Twisp120242018
Vashon Is.120232013
Cougar120222022
Snowden120252012
Kendall120242010
South Elma120232023
Raymond120182018
Rainier120252012
Yakima120212021
Lake Chelan120252022
Mendota 3120152015

Anna's Hummingbird Population Trend in Other States

alaskaarizonacalifornianevadaoregon

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