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Species · Connecticut · BBS 2026 Release · 1966–2025

White-breasted Nuthatch Population Trend in Connecticut

All statesForest birds

White-breasted Nuthatch in Connecticut has surged: up 128% on the route-weighted index since 1968.

+128%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 →
20Routes 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 White-breasted Nuthatch Trends in ConnecticutNotable 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 →

White-breasted Nuthatch has surged in Connecticut: up 128% on the route-weighted index since 1968.

White-breasted Nuthatch Population Forecast in Connecticut

If the recent trend holds, White-breasted Nuthatch in Connecticut is projected to rise about 68% by 2030 — from 5.9 in 2025 to a central estimate of 9.9 (95% range 6.7–13). A 5-year backtest shows a typical error of ±20.2%, with 80% of held-out values landing inside the 95% band.

+68%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 →
9.9Projected 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 →
6.7–1395% 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 →
±20.2%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, White-breasted Nuthatch in Connecticut is projected to rise about 68% by 2030 — from 5.9 in 2025 to a central estimate of 9.9 (95% range 6.7–13). A 5-year backtest shows a typical error of ±20.2%, with 80% 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 →
20269.46.213
20279.56.313
20289.66.513
20299.86.613
20309.96.713

White-breasted Nuthatch Survey Routes in Connecticut

Routes recording White-breasted Nuthatch in Connecticut.
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 →
Uncasville1420251973
Greenwich1420181967
Westbrook1320241969
Mid Haddam1320251973
Buckingham920221967
Sherman920191972
Warren920111972
Willimantic820181967
Danbury820231968
Long Hill720191972
Mystic620231973
Woodstock620071968
No Woodbury620251967
New Hartford620241994
Warren 2520252012
Woodstock 2420252016
Granby420251988
E Hartland219921966
New Hartford219871972
Southington120251973

White-breasted Nuthatch Population Trend in Other States

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