BirdAnalyst
Species · New Hampshire · BBS 2026 Release · 1966–2025

Ruby-crowned Kinglet Population Trend in New Hampshire

All statesForest birds

Ruby-crowned Kinglet in New Hampshire has fallen sharply: down 53% on the route-weighted index since 1968.

-53%Since 1968TrendPercent 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 →
15Routes 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 →
59YearsYears 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 New HampshireNotable 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 declinecomputed 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 fallen sharply in New Hampshire: down 53% on the route-weighted index since 1968.

Ruby-crowned Kinglet Population Forecast in New Hampshire

If the recent trend holds, Ruby-crowned Kinglet in New Hampshire is projected to rise about 40% by 2030 — from 0.13 in 2025 to a central estimate of 0.18 (95% range 0.00–0.83). A 5-year backtest shows a typical error of ±46.4%, with 100% of held-out values landing inside the 95% band.

+40%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 →
0.18Projected 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 →
0.00–0.8395% 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 →
±46.4%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 New Hampshire is projected to rise about 40% by 2030 — from 0.13 in 2025 to a central estimate of 0.18 (95% range 0.00–0.83). A 5-year backtest shows a typical error of ±46.4%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.220.000.86
20270.210.000.85
20280.200.000.84
20290.190.000.84
20300.180.000.83

Ruby-crowned Kinglet Survey Routes in New Hampshire

Routes recording Ruby-crowned Kinglet in New Hampshire.
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 →
Dixvil Notch320171966
Lempster219801974
Jefferson Hl219841966
Clarksville220251966
Glen220051976
Jeffers Ntch220161993
Fitzwilliam119851974
Wilmot119761976
Mt Chocorua119781978
Walpole119691969
Crawford Not119661966
Franconia119951966
Milan119961966
Stratford120231966
Dixville Notch 2120252018

Ruby-crowned Kinglet Population Trend in Other States

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