BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Ruby-crowned Kinglet Population Trend in New Hampshire

All statesForest birds

Ruby-crowned Kinglet in New Hampshire has edged down: down 23% on the route-weighted index since 1968.

-23%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 →
58YearsYears 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 →

No notable trend signals for Ruby-crowned Kinglet in New Hampshire. See the full index history below.

Ruby-crowned Kinglet Population Forecast in New Hampshire

If the recent trend holds, Ruby-crowned Kinglet in New Hampshire is projected to fall about 37% by 2029 — from 0.32 in 2024 to a central estimate of 0.20 (95% range 0.00–0.85). A 5-year backtest shows a typical error of ±47.3%, with 100% of held-out values landing inside the 95% band.

-37%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 →
0.20Projected 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 →
0.00–0.8595% 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 →
±47.3%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 New Hampshire is projected to fall about 37% by 2029 — from 0.32 in 2024 to a central estimate of 0.20 (95% range 0.00–0.85). A 5-year backtest shows a typical error of ±47.3%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.230.000.88
20260.230.000.88
20270.220.000.87
20280.210.000.86
20290.200.000.85

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 →
Clarksville420241966
Dixvil Notch320171966
Dixville Notch 2320242018
Lempster219801974
Jefferson Hl219841966
Glen220051976
Jeffers Ntch220161993
Fitzwilliam119851974
Wilmot119761976
Mt Chocorua119781978
Walpole119691969
Crawford Not119661966
Franconia119951966
Milan119961966
Stratford120231966

Ruby-crowned Kinglet Population Trend in Other States

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