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Species · Colorado · BBS 2026 Release · 1966–2025

Ruby-crowned Kinglet Population Trend in Colorado

All statesForest birds

Ruby-crowned Kinglet in Colorado has surged: up 763% on the route-weighted index since 1970.

+763%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 →
75Routes 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 Ruby-crowned Kinglet Trends in ColoradoNotable 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 surged in Colorado: up 763% on the route-weighted index since 1970.

Ruby-crowned Kinglet Population Forecast in Colorado

If the recent trend holds, Ruby-crowned Kinglet in Colorado is projected to rise about 61% by 2030 — from 6.0 in 2025 to a central estimate of 9.7 (95% range 6.8–13). A 5-year backtest shows a typical error of ±55.3%, with 40% of held-out values landing inside the 95% band.

+61%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 →
9.7Projected 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 →
6.8–1395% 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 →
±55.3%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, Ruby-crowned Kinglet in Colorado is projected to rise about 61% by 2030 — from 6.0 in 2025 to a central estimate of 9.7 (95% range 6.8–13). A 5-year backtest shows a typical error of ±55.3%, 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 →
20269.16.212
20279.26.412
20289.46.512
20299.56.712
20309.76.813

Ruby-crowned Kinglet Survey Routes in Colorado

Routes recording Ruby-crowned Kinglet in Colorado.
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 →
Red Cliff4520251989
Mount Evans4420241996
Dolores Riv4220251988
South Fork4020251994
Haycamp Mesa3620251998
Tincup3420251992
Deadman Rd.3220251992
Heeney 23120252025
Guanella Pas2820251992
Lost Lake2520251990
Owl Creek Pass2420251999
Fox Creek2220251993
Lake City 22220252016
Groundhog Rs2120251992
Stillwater Pass2120092000
Dunckley Pas2020251992
Stillwater Pass 21920252010
Lake City1820031988
Buffalo Park1820251992
Willow Peak1720251988
Steamboat L.1720251996
Comanche Pk1720241994
Thomasville1720251992
Weston Pass1420001994
Heeney1420192017

Ruby-crowned Kinglet Population Trend in Other States

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