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Species · Colorado · BBS 2025 Release · 1966–2024

Ruby-crowned Kinglet Population Trend in Colorado

All statesForest birds

Ruby-crowned Kinglet in Colorado has surged: up 823% on the route-weighted index since 1970.

+823%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 →
74Routes 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 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 823% 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 93% by 2029 — from 5.1 in 2024 to a central estimate of 9.8 (95% range 7.0–13). A 5-year backtest shows a typical error of ±49.2%, with 20% of held-out values landing inside the 95% band.

+93%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 →
9.8Projected 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 →
7.0–1395% 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 →
±49.2%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 93% by 2029 — from 5.1 in 2024 to a central estimate of 9.8 (95% range 7.0–13). A 5-year backtest shows a typical error of ±49.2%, with 20% 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 →
20259.26.412
20269.36.612
20279.56.712
20289.66.912
20299.87.013

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 →
Buffalo Park9520231992
Mount Evans4420241996
Dolores Riv4020241988
Red Cliff3220241989
Lost Lake2920241990
Thomasville2920181992
Haycamp Mesa2920241998
Tincup2620241992
South Fork2520241994
Deadman Rd.2420241992
Fox Creek2420241993
Rollins Pass2320221998
Flattops2220191992
Guanella Pas2220241992
Stillwater Pass2120092000
Lake City1820031988
Lake City 21820242016
Comanche Pk1720241994
Steamboat L.1520241996
Moon Pass1520241998
Willow Peak1420211988
Castleton1420241988
Weston Pass1420001994
Owl Creek Pass1420241999
Heeney1420192017

Ruby-crowned Kinglet Population Trend in Other States

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