BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Cassin's Finch In Great Basin

All regionsGreat BasinForest birds

Cassin's Finch in Great Basin has held roughly steady: down 2% on the route-weighted index since 1970.

-2%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 →
117Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Cassin's Finch in Great Basin. See the full index history below.

Cassin's Finch In Great Basin Population Forecast

If the recent trend holds, Cassin's Finch in Great Basin is projected to stay roughly flat through 2030, near 1.6 (95% range 0.88–2.2). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.

-2%Change by 2030TrendPercent 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 →
1.6Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.88–2.295% 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 →
±25.1%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, Cassin's Finch in Great Basin is projected to stay roughly flat through 2030, near 1.6 (95% range 0.88–2.2). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20261.50.862.2
20271.50.862.2
20281.50.872.2
20291.50.872.2
20301.60.882.2

Routes In Great Basin

Routes recording Cassin's Finch in Great Basin.
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 →
Blewett PassWASHINGTON302025
EllensburgWASHINGTON282025
JarbidgeNEVADA272015
PaisleyOREGON162025
Barnes ValOREGON161987
Lake ChelanWASHINGTON162025
MacdoelCALIFORNIA152019
Crowder FlatCALIFORNIA142019
Magic MtnIDAHO142025
ZumwaltOREGON142005
DeschutesOREGON122022
Bald Mtn.OREGON122025
HarwoodWASHINGTON121993
Silver CityIDAHO112025
BlyOREGON112001
ArdenvoirWASHINGTON111987
Fall River MillsCALIFORNIA102007
RonaldWASHINGTON102025
Medicine Mtn.CALIFORNIA92021
Lapham Res.OREGON92025
LakeviewOREGON92025
Picture FlatOREGON82025
AlmoIDAHO72023
Ruby ValleyNEVADA72001
AustinNEVADA72017

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.