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

Purple Finch In Great Basin

All regionsGreat BasinForest birds

Purple Finch in Great Basin has increased: up 25% on the route-weighted index since 1970.

+25%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 →
57Routes 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 Purple Finch in Great Basin. See the full index history below.

Purple Finch In Great Basin Population Forecast

If the recent trend holds, Purple Finch in Great Basin is projected to stay roughly flat through 2030, near 0.39 (95% range 0.00–0.98). A 5-year backtest shows a typical error of ±35.8%, with 100% of held-out values landing inside the 95% band.

-8%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 →
0.39Projected 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 →
0.00–0.9895% 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 →
±35.8%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, Purple Finch in Great Basin is projected to stay roughly flat through 2030, near 0.39 (95% range 0.00–0.98). A 5-year backtest shows a typical error of ±35.8%, 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 →
20260.400.001.00
20270.400.000.99
20280.400.000.99
20290.390.000.99
20300.390.000.98

Routes In Great Basin

Routes recording Purple 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 →
LeavenworthWASHINGTON172024
L. WenatcheeWASHINGTON122025
Badger CreekOREGON112025
ArdenvoirWASHINGTON111972
MazamaWASHINGTON102022
Crowley LakeCALIFORNIA91977
Crowder FlatCALIFORNIA82002
NubieberCALIFORNIA72007
Wizard FallsOREGON72022
TwispWASHINGTON72024
WinthropWASHINGTON72010
Mt HoodOREGON62025
LikelyCALIFORNIA51978
Davis CreekCALIFORNIA51979
SnowdenWASHINGTON52025
MacdoelCALIFORNIA42016
BartleCALIFORNIA32021
TionestaCALIFORNIA32021
MadelineCALIFORNIA31998
KendallWASHINGTON32025
RonaldWASHINGTON32025
Blewett PassWASHINGTON32025
Clear Lk ResCALIFORNIA21995
HackamoreCALIFORNIA22009
Fall River MillsCALIFORNIA22011

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