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Species · South Carolina · BBS 2026 Release · 1966–2025

Brown-headed Nuthatch Population Trend in South Carolina

All statesForest birds

Brown-headed Nuthatch in South Carolina has edged up: up 24% on the route-weighted index since 1968.

+24%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 →
49Routes 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 Brown-headed Nuthatch Trends in South CarolinaNotable 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 Brown-headed Nuthatch in South Carolina. See the full index history below.

Brown-headed Nuthatch Population Forecast in South Carolina

If the recent trend holds, Brown-headed Nuthatch in South Carolina is projected to fall about 26% by 2030 — from 4.3 in 2025 to a central estimate of 3.1 (95% range 0.52–5.8). A 5-year backtest shows a typical error of ±20.8%, with 100% of held-out values landing inside the 95% band.

-26%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 →
3.1Projected 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 →
0.52–5.895% 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 →
±20.8%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, Brown-headed Nuthatch in South Carolina is projected to fall about 26% by 2030 — from 4.3 in 2025 to a central estimate of 3.1 (95% range 0.52–5.8). A 5-year backtest shows a typical error of ±20.8%, 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 →
20263.20.545.8
20273.20.545.8
20283.20.535.8
20293.20.535.8
20303.10.525.8

Brown-headed Nuthatch Survey Routes in South Carolina

Routes recording Brown-headed Nuthatch in South Carolina.
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 →
Little Mtn1919881966
Mount Pisgah1720251998
Coward1520251966
Salem Xrd1120191982
Sandhills1020251994
Ridgeway920252010
Greenwood920251998
Pinewood920191999
Whitmire820242010
Nixville820251999
Campobello620242010
Salem620252010
Green Sea520252021
Carvers Bay520121998
Prosperity520241992
Owings 2520252005
Rome420251967
Owings419971995
Plum Branch420251977
Joanna420221999
Adams Run420251988
Wagener320181966
Boykin Ml Pd319681966
Boiling Spgs319751967
New Ellenton320252010

Brown-headed Nuthatch Population Trend in Other States

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