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

Evening Grosbeak Population Trend in Massachusetts

All statesGeneralists

Evening Grosbeak in Massachusetts has edged down: down 17% on the route-weighted index since 1991.

-17%Since 1991TrendPercent 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 →
5Routes 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 →
20YearsYears 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 MassachusettsNotable 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 Massachusetts. See the full index history below.

Evening Grosbeak Population Forecast in Massachusetts

If the recent trend holds, Evening Grosbeak in Massachusetts is projected to stay roughly flat through 2024, near 0.12 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±147%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024TrendPercent 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 →
0.12Projected 2024 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.3695% 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 →
±147%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 Massachusetts is projected to stay roughly flat through 2024, near 0.12 (95% range 0.00–0.36). A 5-year backtest shows a typical error of ±147%, with 100% of held-out values landing inside the 95% band.19802024
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 →
20200.130.000.37
20210.120.000.37
20220.120.000.36
20230.120.000.36
20240.120.000.36

Evening Grosbeak Survey Routes in Massachusetts

Routes recording Evening Grosbeak in Massachusetts.
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 →
Ware River120021995
N Orange120091990
Cummington120101990
Chesterfield120191980
Cheshire119901990

Evening Grosbeak Population Trend in Other States

arizonacaliforniacoloradoconnecticutidahomainemichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwashingtonwisconsinwyoming

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