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

Cassin's Finch In Great Basin

All regionsGreat BasinGeneralists

Cassin's Finch in Great Basin has held roughly steady: up 3% on the route-weighted index since 1970.

+3%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 →
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 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 rise about 56% by 2029 — from 0.99 in 2024 to a central estimate of 1.5 (95% range 0.87–2.2). A 5-year backtest shows a typical error of ±27.1%, with 100% of held-out values landing inside the 95% band.

+56%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 →
1.5Projected 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 →
0.87–2.295% 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 →
±27.1%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 rise about 56% by 2029 — from 0.99 in 2024 to a central estimate of 1.5 (95% range 0.87–2.2). A 5-year backtest shows a typical error of ±27.1%, 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 →
20251.50.852.2
20261.50.852.2
20271.50.862.2
20281.50.862.2
20291.50.872.2

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 →
JarbidgeNEVADA272015
Silver CityIDAHO172024
Barnes ValOREGON161987
MacdoelCALIFORNIA152019
Crowder FlatCALIFORNIA142019
Lapham Res.OREGON142024
ZumwaltOREGON142005
DeschutesOREGON122022
PaisleyOREGON122024
HarwoodWASHINGTON121993
BlyOREGON112001
ArdenvoirWASHINGTON111987
Fall River MillsCALIFORNIA102007
Blewett PassWASHINGTON102024
Medicine Mtn.CALIFORNIA92021
EllensburgWASHINGTON92024
Bly 2OREGON82024
AlmoIDAHO72023
Ruby ValleyNEVADA72001
AustinNEVADA72017
LakeviewOREGON72024
Lake ChelanWASHINGTON72024
BatesIDAHO62013
Picture FlatOREGON62024
ChinchaloOREGON62022

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