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Species · Wisconsin · BBS 2026 Release · 1966–2025

White-throated Sparrow Population Trend in Wisconsin

All statesForest birds

White-throated Sparrow in Wisconsin has edged up: up 16% on the route-weighted index since 1968.

+16%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 →
57Routes 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-throated Sparrow 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 →

No notable trend signals for White-throated Sparrow in Wisconsin. See the full index history below.

White-throated Sparrow Population Forecast in Wisconsin

If the recent trend holds, White-throated Sparrow in Wisconsin is projected to rise about 93% by 2030 — from 2.3 in 2025 to a central estimate of 4.5 (95% range 2.4–6.6). A 5-year backtest shows a typical error of ±107.6%, with 0% of held-out values landing inside the 95% band.

+93%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 →
4.5Projected 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 →
2.4–6.695% 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 →
±107.6%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-throated Sparrow in Wisconsin is projected to rise about 93% by 2030 — from 2.3 in 2025 to a central estimate of 4.5 (95% range 2.4–6.6). A 5-year backtest shows a typical error of ±107.6%, with 0% 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 →
20264.42.36.6
20274.42.36.6
20284.52.36.6
20294.52.46.6
20304.52.46.6

White-throated Sparrow Survey Routes in Wisconsin

Routes recording White-throated Sparrow 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 →
Land O Lakes2120161967
Montreal2020251968
Land O' Lakes 21920252017
Eagle River1520251966
Chaffey1420251966
Bayfield1420251967
Hollister1320251967
Popple River1220251966
Shanagolden1120251966
Rhinelander920231998
Iron River820251967
Merrill820251966
Mellen720251998
Conover620251998
Flambeau620251998
Cavour620251998
Amnicon Falls520251998
Irma420251967
Amberg420251980
Weirgor Springs420251999
Mcnaughton320241966
Hatfield319981970
Exeland220211969
Holway219891967
Crandon220251967

White-throated Sparrow Population Trend in Other States

connecticutmainemassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-dakotapennsylvaniavermontwest-virginia

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