BirdAnalyst
Species · Wisconsin · BBS 2025 Release · 1966–2024

Eastern Bluebird Population Trend in Wisconsin

All statesForest birds

Eastern Bluebird in Wisconsin has edged down: down 20% on the route-weighted index since 1968.

-20%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 →
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 Eastern Bluebird 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 Eastern Bluebird in Wisconsin. See the full index history below.

Eastern Bluebird Population Forecast in Wisconsin

If the recent trend holds, Eastern Bluebird in Wisconsin is projected to rise about 24% by 2029 — from 3.3 in 2024 to a central estimate of 4.1 (95% range 1.6–6.6). A 5-year backtest shows a typical error of ±265%, with 20% of held-out values landing inside the 95% band.

+24%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 →
4.1Projected 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 →
1.6–6.695% 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 →
±265%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, Eastern Bluebird in Wisconsin is projected to rise about 24% by 2029 — from 3.3 in 2024 to a central estimate of 4.1 (95% range 1.6–6.6). A 5-year backtest shows a typical error of ±265%, with 20% 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 →
20253.91.46.4
20264.01.56.5
20274.01.56.5
20284.01.56.5
20294.11.66.6

Eastern Bluebird Survey Routes in Wisconsin

Routes recording Eastern Bluebird 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 →
River Falls1520241998
Cochrane1120241966
N Freedom1120241968
Union Twp1020241966
Cumberland1020241966
Clintonville1020241970
Fall River1020241967
Omro920011966
Gresham920241998
Rolling Grnd820241966
New Lisbon820241967
Hazel Green820241966
Meridean820241998
Prairie Du Chien820241998
Merrill720171967
Hatfield719981970
Stevens Pt720231966
Couderay620191969
Pardeeville620241969
Eden620241966
N Andover620241967
Wiota620241966
Briggsville620241999
Minong520241969
Weyerhauser520241966

Eastern Bluebird Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawyoming

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