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

Evening Grosbeak Population Trend in Oregon

All statesGeneralists

Evening Grosbeak in Oregon has fallen sharply: down 58% on the route-weighted index since 1970.

-58%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 →
96Routes 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 →
56YearsYears 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 OregonNotable 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 Oregon: down 58% on the route-weighted index since 1970.

Evening Grosbeak Population Forecast in Oregon

If the recent trend holds, Evening Grosbeak in Oregon is projected to rise about 13% by 2029 — from 0.87 in 2024 to a central estimate of 0.99 (95% range 0.00–6.9). A 5-year backtest shows a typical error of ±30%, with 100% of held-out values landing inside the 95% band.

+13%Change 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 →
0.99Projected 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 →
0.00–6.995% 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 →
±30%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 Oregon is projected to rise about 13% by 2029 — from 0.87 in 2024 to a central estimate of 0.99 (95% range 0.00–6.9). A 5-year backtest shows a typical error of ±30%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20251.20.007.1
20261.10.007.1
20271.10.007.0
20281.00.007.0
20290.990.006.9

Evening Grosbeak Survey Routes in Oregon

Routes recording Evening Grosbeak in Oregon.
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 →
Fisher13320101997
Harlan 22920242011
Klickitat Mt2619961993
Barnes Val1719871987
Timber1520171968
Harney Lake1419961996
Harlan1420092006
Paunina1220121994
Dell Spring1119881969
Nicolai Mtn.1120241993
Trask Summit1120241992
Lorane820241993
Ochoco719821976
Winberry720231968
Scio720221971
Fisher 2720242018
Pendleton619941984
Waldport619991992
Monument619931993
Bridgeport519911990
Mount Vernon519961986
Elkton520231991
Zumwalt519991997
Eagle Rock419791976
Bly419921973

Evening Grosbeak Population Trend in Other States

arizonacaliforniacoloradoconnecticutidahomainemassachusettsmichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorksouth-dakotautahvermontwashingtonwisconsinwyoming

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