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Species · BCR 12 · BBS 2025 Release · 1966–2024

Ruby-crowned Kinglet In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Ruby-crowned Kinglet in Boreal Hardwood Transition has held roughly steady: down 6% on the route-weighted index since 1969.

-6%Since 1969TrendPercent 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 →
88Routes In RegionSurvey 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 SignalsNotable 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 Ruby-crowned Kinglet in Boreal Hardwood Transition. See the full index history below.

Ruby-crowned Kinglet In Boreal Hardwood Transition Population Forecast

If the recent trend holds, Ruby-crowned Kinglet in Boreal Hardwood Transition is projected to rise about 39% by 2029 — from 0.33 in 2024 to a central estimate of 0.46 (95% range 0.08–0.85). A 5-year backtest shows a typical error of ±27.3%, with 80% of held-out values landing inside the 95% band.

+39%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 →
0.46Projected 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 →
0.08–0.8595% 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 →
±27.3%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 Boreal Hardwood Transition is projected to rise about 39% by 2029 — from 0.33 in 2024 to a central estimate of 0.46 (95% range 0.08–0.85). A 5-year backtest shows a typical error of ±27.3%, with 80% of held-out values landing inside the 95% band.19672029
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 →
20250.470.090.86
20260.470.090.86
20270.470.080.85
20280.470.080.85
20290.460.080.85

Routes In Boreal Hardwood Transition

Routes recording Ruby-crowned Kinglet in Boreal Hardwood Transition.
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 →
Seney NwrMICHIGAN72019
HovlandMINNESOTA52022
Cluster LakesMICHIGAN42009
Sawbill CampMINNESOTA42024
OntonagonMICHIGAN32019
Sawbill LndgMINNESOTA32024
Sherry LakeMINNESOTA32018
BabbittMINNESOTA32023
ChisholmMINNESOTA32024
MareniscoMICHIGAN22019
HermanMICHIGAN22022
Gibbs CityMICHIGAN22024
CreightonMICHIGAN22015
Imp LakeMICHIGAN22019
BackusMINNESOTA21978
Hart LakeMINNESOTA22024
BemidjiMINNESOTA21980
Crane LakeMINNESOTA22022
Little ForkMINNESOTA22023
JordanMINNESOTA22022
Red LakeMINNESOTA22024
Nett LakeMINNESOTA22018
ShanagoldenWISCONSIN22019
CavourWISCONSIN22023
BerglandMICHIGAN12019

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