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

Blue Jay Population Trend in Wisconsin

All statesGeneralists

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 →
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 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 2029, near 12 (95% range 8.3–15). A 5-year backtest shows a typical error of ±7.3%, with 100% of held-out values landing inside the 95% band.

-7%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 →
12Projected 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 →
8.3–1595% 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 →
±7.3%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 2029, near 12 (95% range 8.3–15). A 5-year backtest shows a typical error of ±7.3%, with 100% 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 →
2025128.515
2026128.515
2027128.415
2028128.415
2029128.315

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 →
Washington I4020241967
Hatfield3719981970
Cadott3320241966
Union Twp3220241966
River Falls3120241998
Iron River2620241967
Amberg2420241980
Saxeville2320241966
Grand View2220241966
Weyerhauser2220241966
Popple River2220241966
Wausaukee2220241980
Amnicon Falls2220241998
Bayfield2120241967
Shanagolden2120241966
Montreal2120241968
Meridean1920241998
N Freedom1820241966
Mellen1820241998
Conover1820241998
Weirgor Springs1820241999
Pigeon Creek1720241999
Cumberland1620241966
Rib Lake1620241966
Omro1620011966

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 2026-05-22.