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Species · Colorado · BBS 2025 Release · 1966–2024

Cassin's Finch Population Trend in Colorado

All statesGeneralists

Cassin's Finch in Colorado has surged: up 514% on the route-weighted index since 1971.

+514%Since 1971
80Routes In State
54Years

Notable Cassin's Finch Trends in Colorado

long arc increasecomputed index

Cassin's Finch has surged in Colorado: up 514% on the route-weighted index since 1971.

Cassin's Finch Population Forecast in Colorado

If the recent trend holds, Cassin's Finch in Colorado is projected to rise about 48% by 2029 — from 0.62 in 2024 to a central estimate of 0.92 (95% range 0.07–1.8). A 5-year backtest shows a typical error of ±50.9%, with 100% of held-out values landing inside the 95% band.

+48%Change by 2029
0.92Projected 2029 index
0.07–1.895% range
±50.9%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.880.041.7
20260.890.051.7
20270.900.061.7
20280.910.061.7
20290.920.071.8

Cassin's Finch Survey Routes in Colorado

Routes recording Cassin's Finch in Colorado.
Deadman Rd.1620241992
Buffalo Park1420231992
Cortez 2820142014
Pinos Creek619901988
Blackhead Pk620211995
Powderhorn620231996
Parlin520181970
Castleton520241988
Colona 2520182016
Summitville520121991
Owl Creek Pass520241998
Uncompahgre420241988
Mcphee Res.420242001
Radium420132011
Nucla420242000
Mesaverde Np420061996
Trail Ridge Road420132003
Guffey320241992
Dinosaur320111996
Baxter Pass320241994
Black Sulphur Cr320212015
Yampa220171970
Delta220211974
Pagosa Spgs219821973
Wilson Creek220081993

Cassin's Finch Population Trend in Other States

arizonacaliforniaidahomontananevadanew-mexicooregonsouth-dakotautahwashingtonwyoming

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