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

Dickcissel Population Trend in Wisconsin

All statesGrassland birds

Dickcissel in Wisconsin has fallen sharply: down 72% on the route-weighted index since 1968.

-72%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 →
86Routes 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 Dickcissel 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Dickcissel has fallen sharply in Wisconsin: down 72% on the route-weighted index since 1968.

Dickcissel Population Forecast in Wisconsin

If the recent trend holds, Dickcissel in Wisconsin is projected to stay roughly flat through 2030, near 2.9 (95% range 0.00–9.2). A 5-year backtest shows a typical error of ±51.2%, with 80% 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 →
2.9Projected 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 →
0.00–9.295% 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 →
±51.2%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, Dickcissel in Wisconsin is projected to stay roughly flat through 2030, near 2.9 (95% range 0.00–9.2). A 5-year backtest shows a typical error of ±51.2%, with 80% 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 →
20262.90.009.3
20272.90.009.2
20282.90.009.2
20292.90.009.2
20302.90.009.2

Dickcissel Survey Routes in Wisconsin

Routes recording Dickcissel 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 →
Grimms4120211999
N Andover3620251967
Hazel Green3120251966
Wiota2420251966
Brownsville1920251966
Viroqua1720231966
Prairie Du Chien1620242000
Wis Rapids1320231969
Highland1120251998
Stetsonville920231998
Kiel920252000
Annaton920252000
Beloit920251999
Holland920251999
Manawa820181966
Casco720251966
Pardeeville720251967
Iron River620232012
Loraine620181967
Trempealeau620251966
Cadott620251966
Unity620231967
Newburg Crns620251966
New Lisbon620251967
Union Twp520232012

Dickcissel Population Trend in Other States

alabamaarkansascoloradodelawaregeorgiaillinoisindianaiowakansaskentuckylouisianamarylandmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasvirginiawest-virginiawyoming

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