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

Blue Jay Population Trend in Wisconsin

All statesForest birds

Blue Jay in Wisconsin has held roughly steady: up 4% on the route-weighted index since 1968.

+4%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 Blue Jay 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 Blue Jay in Wisconsin. See the full index history below.

Blue Jay Population Forecast in Wisconsin

If the recent trend holds, Blue Jay in Wisconsin is projected to stay roughly flat through 2030, near 12 (95% range 8.4–15). A 5-year backtest shows a typical error of ±4.1%, with 100% of held-out values landing inside the 95% band.

-3%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 →
12Projected 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 →
8.4–1595% 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 →
±4.1%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, Blue Jay in Wisconsin is projected to stay roughly flat through 2030, near 12 (95% range 8.4–15). A 5-year backtest shows a typical error of ±4.1%, 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 →
2026128.515
2027128.515
2028128.415
2029128.415
2030128.415

Blue Jay Survey Routes in Wisconsin

Routes recording Blue Jay 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 →
Union Twp3920251966
Washington I3820251967
Hatfield3719981970
Wausaukee2820251980
Paris2520251966
Amberg2420251980
Meridean2320251998
Wiota2220251966
Weirgor Springs2220251999
Weyerhauser2120251966
Fall River2120251966
Minong2020251967
Popple River2020251966
Bashaw2020251998
Mellen1920251998
Conover1920251998
Mukwonago 21920252005
Cadott1820251966
Raymond1820251966
Saxeville1720251966
Gresham1720251998
Grand View1620251966
Omro1620011966
Omro 21620252002
Amnicon Falls1620251998

Blue Jay Population Trend in Other States

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

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