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

Ruby-crowned Kinglet Population Trend in Washington

All statesForest birds

Ruby-crowned Kinglet in Washington has risen sharply: up 72% on the route-weighted index since 1971.

+72%Since 1971TrendPercent 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 →
48Routes 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 →
55YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ruby-crowned Kinglet 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 →

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 →

Ruby-crowned Kinglet has risen sharply in Washington: up 72% on the route-weighted index since 1971.

Ruby-crowned Kinglet Population Forecast in Washington

If the recent trend holds, Ruby-crowned Kinglet in Washington is projected to stay roughly flat through 2029, near 0.75 (95% range 0.17–1.3). A 5-year backtest shows a typical error of ±134.9%, with 60% of held-out values landing inside the 95% band.

+4%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 →
0.75Projected 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 →
0.17–1.395% 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 →
±134.9%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, Ruby-crowned Kinglet in Washington is projected to stay roughly flat through 2029, near 0.75 (95% range 0.17–1.3). A 5-year backtest shows a typical error of ±134.9%, 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 →
20250.720.141.3
20260.730.151.3
20270.740.161.3
20280.740.171.3
20290.750.171.3

Ruby-crowned Kinglet Survey Routes in Washington

Routes recording Ruby-crowned Kinglet 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 →
Cloverland2820241993
Spring Lake720241982
Lake Chelan720191989
Issaquah619771977
Keller419951969
Everett419951977
Carlton420221992
Omak Creek420241996
Chewelah320121978
Nighthawk319921992
Curlew320131993
Ardenvoir219721969
Mendota 2219931990
Reardan219691969
Rimrock219691969
Asotin220241987
Leavenworth219811981
Mendota219881988
Suiattle Riv220031994
Mazama220221993
Laurier220161997
Northport220181996
Port Angeles119961996
Twisp120142014
Montesand119921988

Ruby-crowned Kinglet Population Trend in Other States

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