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

Evening Grosbeak Population Trend in Wyoming

All statesGeneralists

Evening Grosbeak in Wyoming has fallen sharply: down 74% on the route-weighted index since 1980.

-74%Since 1980TrendPercent 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 →
14Routes 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 →
21YearsYears 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 WyomingNotable 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 →

Evening Grosbeak has fallen sharply in Wyoming: down 74% on the route-weighted index since 1980.

Evening Grosbeak Population Forecast in Wyoming

If the recent trend holds, Evening Grosbeak in Wyoming is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±43%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.02Projected 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 →
0.00–0.2395% 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 →
±43%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 Wyoming is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±43%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.030.000.24
20260.030.000.24
20270.020.000.23
20280.020.000.23
20290.020.000.23

Evening Grosbeak Survey Routes in Wyoming

Routes recording Evening Grosbeak in Wyoming.
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 →
Horse Creek1019881988
Buford820182018
Wilson719831980
Brookhurst419991998
Hunter Peak319831982
Ryan Park320122012
Mammoth319871983
Savery219951989
Moskee 2220162016
Moose119801980
Colter Bay119701970
Dubois119721972
Buckskin Mtn120211994
Alpine120241980

Evening Grosbeak Population Trend in Other States

arizonacaliforniacoloradoconnecticutidahomainemassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonsouth-dakotautahvermontwashingtonwisconsin

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