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

Ruby-crowned Kinglet Population Trend in Idaho

All statesForest birds

Ruby-crowned Kinglet in Idaho has surged: up 249% on the route-weighted index since 1970.

+249%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 →
43Routes 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 IdahoNotable 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 Idaho: up 249% on the route-weighted index since 1970.

Ruby-crowned Kinglet Population Forecast in Idaho

If the recent trend holds, Ruby-crowned Kinglet in Idaho is projected to stay roughly flat through 2029, near 5.2 (95% range 3.0–7.3). A 5-year backtest shows a typical error of ±17.8%, with 100% of held-out values landing inside the 95% band.

+2%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 →
5.2Projected 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 →
3.0–7.395% 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 →
±17.8%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 Idaho is projected to stay roughly flat through 2029, near 5.2 (95% range 3.0–7.3). A 5-year backtest shows a typical error of ±17.8%, with 100% 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 →
20254.92.87.0
20265.02.87.1
20275.02.97.2
20285.13.07.2
20295.23.07.3

Ruby-crowned Kinglet Survey Routes in Idaho

Routes recording Ruby-crowned Kinglet in Idaho.
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 →
Lolo Pass2820191992
Squirrel2820241971
Cobalt2820241989
Burgdorf2620161988
Cape Horn1820241972
Grangeville1720241986
Nezperce Nf1619991992
Cascade1519841970
Baldy Mountain1420162013
Yellow Pine1320161989
Golden1020161987
Challis920241976
Magic Mtn920241987
Rochat Divde820231993
Cabarton820231985
Avery620231979
Sawtooth City 2620242015
Pierce620051990
Sawtooth Cty620141988
Alturas519871968
Sunbeam420191994
Silver City420241989
Featherville420241989
Centerville220131983
Coolin220242002

Ruby-crowned Kinglet Population Trend in Other States

alaskaarizonacaliforniacoloradomainemichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwashingtonwisconsinwyoming

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