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

Lazuli Bunting Population Trend in Washington

All statesGeneralists

Lazuli Bunting in Washington has increased: up 27% on the route-weighted index since 1970.

+27%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 →
70Routes 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 →
56YearsYears 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 33% by 2029 — from 3.4 in 2024 to a central estimate of 2.2 (95% range 0.96–3.5). A 5-year backtest shows a typical error of ±39.5%, with 60% of held-out values landing inside the 95% band.

-33%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 →
2.2Projected 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 →
0.96–3.595% 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 →
±39.5%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, Lazuli Bunting in Washington is projected to fall about 33% by 2029 — from 3.4 in 2024 to a central estimate of 2.2 (95% range 0.96–3.5). A 5-year backtest shows a typical error of ±39.5%, with 60% of held-out values landing inside the 95% band.19682029
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 →
20252.20.903.5
20262.20.913.5
20272.20.933.5
20282.20.943.5
20292.20.963.5

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 Chelan3820241988
Twisp2620241969
Cloverland2620241993
Nighthawk1620241993
Ellensburg1520241985
Yakima1520241993
Keller1420071968
Laurier1420221996
Chewelah820211977
Wapato820221978
Scootney Reservoir720242009
Ewan620191985
Spring Lake620241992
Blewett Pass620172005
Rimrock520231968
Northport520241996
Moses Coulee520231993
Selah420232000
Reardan420241968
Cougar420211972
Camas420091977
Everett420242016
Wilbur420241995
Deer Park420151994
Mendota 3420242009

Lazuli Bunting Population Trend in Other States

arizonacaliforniacoloradoidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwyoming

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