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Species · Wyoming · BBS 2026 Release · 1966–2025

Cassin's Finch Population Trend in Wyoming

All statesForest birds

Cassin's Finch in Wyoming has risen sharply: up 69% on the route-weighted index since 1974.

+69%Since 1974TrendPercent 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 →
41Routes 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 →
51YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Cassin's Finch Trends in WyomingNotable 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 increasecomputed 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 →

Cassin's Finch has risen sharply in Wyoming: up 69% on the route-weighted index since 1974.

Cassin's Finch Population Forecast in Wyoming

If the recent trend holds, Cassin's Finch in Wyoming is projected to stay roughly flat through 2030, near 0.48 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±94.5%, with 100% of held-out values landing inside the 95% band.

-4%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 →
0.48Projected 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 →
0.00–1.495% 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 →
±94.5%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 Wyoming is projected to stay roughly flat through 2030, near 0.48 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±94.5%, 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 →
20260.520.001.4
20270.510.001.4
20280.500.001.4
20290.490.001.4
20300.480.001.4

Cassin's Finch Survey Routes in Wyoming

Routes recording Cassin's Finch in Wyoming.
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 →
Ryan Park2020252011
Colter Bay919991968
West Thumb719821982
Carter620162016
Ne Entrance420251982
Buckskin Mtn420251980
Savery 2420252007
Yellowstone320251988
Moose320151976
Crazy Woman320241979
Fiddler Lk320251979
Moran320162003
Basin219741974
Savery219951989
Frannie220181989
Meeteetse220212011
Alpine220251979
Shawnee220042004
Fox Park220252015
Cody120191993
Otto119741974
Hayden Val119851985
Sundance120221984
Dubois120251973
Prior Flats120251991

Cassin's Finch Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadanew-mexicooregonsouth-dakotautahwashington

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