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

Rose-breasted Grosbeak Population Trend in Wisconsin

All statesForest birds

Rose-breasted Grosbeak in Wisconsin has held roughly steady: up 8% on the route-weighted index since 1968.

+8%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 Rose-breasted Grosbeak 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 Rose-breasted Grosbeak in Wisconsin. See the full index history below.

Rose-breasted Grosbeak Population Forecast in Wisconsin

If the recent trend holds, Rose-breasted Grosbeak in Wisconsin is projected to stay roughly flat through 2030, near 6.8 (95% range 4.8–8.7). A 5-year backtest shows a typical error of ±2.8%, with 100% of held-out values landing inside the 95% band.

-7%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 →
6.8Projected 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 →
4.8–8.795% 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 →
±2.8%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, Rose-breasted Grosbeak in Wisconsin is projected to stay roughly flat through 2030, near 6.8 (95% range 4.8–8.7). A 5-year backtest shows a typical error of ±2.8%, 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 →
20266.94.98.9
20276.94.98.8
20286.84.98.8
20296.84.88.8
20306.84.88.7

Rose-breasted Grosbeak Survey Routes in Wisconsin

Routes recording Rose-breasted Grosbeak 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 →
Popple River2720251966
Cavour2420251998
Stetsonville2120251990
Weyerhauser2020251966
Holway1919891967
Land O' Lakes 21820252018
Bashaw1820251998
Merrill1620251966
Gilmanton1620251966
Wausaukee1520251980
Viroqua1520241966
Prairie Du Chien1420251998
New Lisbon1320251967
N Andover1320251971
Buena Vista1320251998
Dresser1220251966
Amberg1220251980
Weirgor Springs1220251999
Briggsville1220251999
Hollister1120251967
Stratford1120251967
Saxeville1120251966
N Freedom1120251966
Gilman1020251966
Hatfield1019981970

Rose-breasted Grosbeak Population Trend in Other States

arkansasconnecticutgeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-dakotatennesseevermontvirginiawest-virginiawyoming

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