BirdAnalyst
Species · Wisconsin · BBS 2026 Release · 1966–2025

Eastern Bluebird Population Trend in Wisconsin

All statesForest birds

Eastern Bluebird in Wisconsin has held roughly steady: up 2% on the route-weighted index since 1968.

+2%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 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 42% by 2030 — from 2.8 in 2025 to a central estimate of 4.0 (95% range 1.5–6.5). A 5-year backtest shows a typical error of ±243.6%, with 40% of held-out values landing inside the 95% band.

+42%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 →
4.0Projected 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 →
1.5–6.595% 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 →
±243.6%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, Eastern Bluebird in Wisconsin is projected to rise about 42% by 2030 — from 2.8 in 2025 to a central estimate of 4.0 (95% range 1.5–6.5). A 5-year backtest shows a typical error of ±243.6%, with 40% 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 →
20263.91.46.4
20273.91.46.4
20284.01.56.5
20294.01.56.5
20304.01.56.5

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 →
Fall River1320251967
Union Twp1020251966
Cochrane1020251966
Wiota1020251966
Omro920011966
Meridean920251998
Clintonville820251970
Highland820251998
Loraine720251966
Hatfield719981970
Stevens Pt720231966
N Freedom720251968
Gresham720251998
Couderay620191969
Trempealeau620251966
Kendall620251967
Hebron620251967
Paris620251966
Briggsville620251999
Minong520241969
Hudson520251966
Weyerhauser520251966
Rolling Grnd520251966
Prairie Du Chien520251998
Iron River420251968

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 2026-08-14.