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Species · Washington · BBS 2026 Release · 1966–2025

Lazuli Bunting Population Trend in Washington

All statesForest birds

Lazuli Bunting in Washington has increased: up 31% on the route-weighted index since 1970.

+31%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 →
71Routes 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 →
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 Lazuli Bunting 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 Lazuli Bunting in Washington. See the full index history below.

Lazuli Bunting Population Forecast in Washington

If the recent trend holds, Lazuli Bunting in Washington is projected to fall about 34% by 2030 — from 3.6 in 2025 to a central estimate of 2.4 (95% range 1.0–3.7). A 5-year backtest shows a typical error of ±41.3%, with 40% of held-out values landing inside the 95% band.

-34%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 →
2.4Projected 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 →
1.0–3.795% 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 →
±41.3%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, Lazuli Bunting in Washington is projected to fall about 34% by 2030 — from 3.6 in 2025 to a central estimate of 2.4 (95% range 1.0–3.7). A 5-year backtest shows a typical error of ±41.3%, with 40% 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 →
20262.30.983.6
20272.30.993.7
20282.31.03.7
20292.41.03.7
20302.41.03.7

Lazuli Bunting Survey Routes in Washington

Routes recording Lazuli Bunting 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 →
Lake Chelan3220251988
Twisp2620241969
Nighthawk2320251993
Cloverland2120251993
Ellensburg1720251985
Yakima1520251993
Keller1420071968
Chewelah820211977
Wapato820221978
Moses Coulee820251993
E. Mt. Adams620251997
Everett620252016
Ewan620191985
Spring Lake620251992
Blewett Pass620172005
Newhalem420251969
Selah420252000
Reardan420241968
Cougar420211972
Camas420091977
Wilbur420251995
Scootney Reservoir420252009
Laurier420251996
Deer Park420151994
Ardenvoir319851970

Lazuli Bunting Population Trend in Other States

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