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Species · Wisconsin · BBS 2026 Release · 1966–2025

White-breasted Nuthatch Population Trend in Wisconsin

All statesForest birds

White-breasted Nuthatch in Wisconsin has surged: up 90% on the route-weighted index since 1968.

+90%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 →
98Routes 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 WisconsinNotable 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 Wisconsin: up 90% on the route-weighted index since 1968.

White-breasted Nuthatch Population Forecast in Wisconsin

If the recent trend holds, White-breasted Nuthatch in Wisconsin is projected to rise about 36% by 2030 — from 2.7 in 2025 to a central estimate of 3.6 (95% range 2.3–5.0). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.

+36%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 →
3.6Projected 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 →
2.3–5.095% 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 →
±23.1%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 Wisconsin is projected to rise about 36% by 2030 — from 2.7 in 2025 to a central estimate of 3.6 (95% range 2.3–5.0). A 5-year backtest shows a typical error of ±23.1%, 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 →
20263.52.24.9
20273.62.24.9
20283.62.24.9
20293.62.35.0
20303.62.35.0

White-breasted Nuthatch Survey Routes in Wisconsin

Routes recording White-breasted Nuthatch in Wisconsin.
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 →
Princeton1720241966
Bashaw1120251998
Beloit1120252000
Union Twp1020251966
Trempealeau1020251966
N Freedom920251966
Paris920251968
Viroqua820241966
Meridean820251998
Wiota720251966
Briggsville720241999
Dresser620251966
Gilman620251966
Oconto Falls620231968
Raymond620251968
Weirgor Springs620242002
Land O Lakes520161975
Loraine520251967
Esdaile520251966
Cadott520251966
Mather520231966
Mukwonago 2520252005
Cumberland420251966
Weyerhauser420251966
Cochrane420251967

White-breasted Nuthatch Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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