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

Evening Grosbeak Population Trend in Wisconsin

All statesGeneralists

Evening Grosbeak in Wisconsin has declined: down 42% on the route-weighted index since 1970.

-42%Since 1970TrendPercent 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 →
30Routes 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 →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Evening 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 Evening Grosbeak in Wisconsin. See the full index history below.

Evening Grosbeak Population Forecast in Wisconsin

If the recent trend holds, Evening Grosbeak in Wisconsin is projected to rise about 122% by 2022 — from 0.09 in 2017 to a central estimate of 0.21 (95% range 0.00–0.58). A 5-year backtest shows a typical error of ±537%, with 100% of held-out values landing inside the 95% band.

+122%Change by 2022TrendPercent 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 →
0.21Projected 2022 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.5895% 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 →
±537%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, Evening Grosbeak in Wisconsin is projected to rise about 122% by 2022 — from 0.09 in 2017 to a central estimate of 0.21 (95% range 0.00–0.58). A 5-year backtest shows a typical error of ±537%, with 100% of held-out values landing inside the 95% band.19682022
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 →
20180.210.000.58
20190.210.000.58
20200.210.000.58
20210.210.000.58
20220.210.000.58

Evening Grosbeak Survey Routes in Wisconsin

Routes recording Evening 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 →
Mcnaughton2520111981
Iron River619951968
Popple River520171969
Hollister420001980
Gresham320031999
Bayfield220131974
Loraine219871987
Rib Lake219991988
Irma220071989
Crandon220051985
Wausaukee220101980
Oconto Falls220051977
Conover220101998
Chaffey120041972
Minong120021975
Grand View120171968
Shanagolden120151978
Montreal120121968
Land O Lakes120111969
Union Twp120172017
Couderay119881988
Phillips119911990
Merrill119951995
Eagle River120111977
Amberg120101990

Evening Grosbeak Population Trend in Other States

arizonacaliforniacoloradoconnecticutidahomainemassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwashingtonwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.