BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Evening Grosbeak In Great Basin

All regionsGreat BasinGeneralists

Evening Grosbeak in Great Basin has collapsed: down 79% on the route-weighted index since 1970.

-79%Since 1970
76Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Evening Grosbeak has collapsed in Great Basin: down 79% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Evening Grosbeak in Great Basin is projected to rise about 28% by 2029 — from 0.52 in 2024 to a central estimate of 0.67 (95% range 0.00–3.9). A 5-year backtest shows a typical error of ±229%, with 100% of held-out values landing inside the 95% band.

+28%Change by 2029
0.67Projected 2029 index
0.00–3.995% range
±229%Backtest error
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 index95% low95% high
20250.830.004.1
20260.790.004.1
20270.750.004.0
20280.710.004.0
20290.670.003.9

Routes In Great Basin

Routes recording Evening Grosbeak in Great Basin.
WinthropWASHINGTON282009
E. Mt. AdamsWASHINGTON202024
Barnes ValOREGON171987
L. WenatcheeWASHINGTON152024
DorrisCALIFORNIA142011
Harney LakeOREGON141996
NewhalemWASHINGTON142024
Clear Lk ResCALIFORNIA131991
PauninaOREGON122012
Dell SpringOREGON111988
RonaldWASHINGTON72024
MacdoelCALIFORNIA61994
PendletonOREGON61994
Hardware RanchUTAH61994
CarltonWASHINGTON62013
NighthawkWASHINGTON62013
ZumwaltOREGON51999
BlyOREGON41992
KendallWASHINGTON42024
TionestaCALIFORNIA32021
Fall River MillsCALIFORNIA32007
Medicine Mtn.CALIFORNIA32021
Iron GateCALIFORNIA31988
LeadoreIDAHO32009
Mt HoodOREGON32022

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