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Species · Wyoming · BBS 2025 Release · 1966–2024

Cassin's Finch Population Trend in Wyoming

All statesGeneralists

Cassin's Finch in Wyoming has increased: up 41% on the route-weighted index since 1974.

+41%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 →
50YearsYears 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 →

No notable trend signals for Cassin's Finch in Wyoming. See the full index history below.

Cassin's Finch Population Forecast in Wyoming

If the recent trend holds, Cassin's Finch in Wyoming is projected to rise about 157% by 2029 — from 0.19 in 2024 to a central estimate of 0.49 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±117.6%, with 100% of held-out values landing inside the 95% band.

+157%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 →
0.49Projected 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 →
0.00–1.495% 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 →
±117.6%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 rise about 157% by 2029 — from 0.19 in 2024 to a central estimate of 0.49 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±117.6%, 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 →
20250.530.001.4
20260.520.001.4
20270.510.001.4
20280.500.001.4
20290.490.001.4

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 →
Colter Bay919991968
Ryan Park920232011
West Thumb719821982
Carter620162016
Yellowstone420221988
Buckskin Mtn420211980
Ne Entrance320191982
Dubois320241973
Moose320151976
Crazy Woman320241979
Moran320162003
Savery 2320242007
Basin219741974
Savery219951989
Hunter Peak220081982
Frannie220181989
Meeteetse220212011
Bald Mtn220211990
Fiddler Lk220241979
Shawnee220042004
Cody120191993
Otto119741974
Hayden Val119851985
Sundance120221984
Prior Flats120221991

Cassin's Finch Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadanew-mexicooregonsouth-dakotautahwashington

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