BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Sage Thrasher Population Trend in Colorado

All statesGeneralists

Sage Thrasher in Colorado has surged: up 798% on the route-weighted index since 1970.

+798%Since 1970
66Routes In State
56Years

Notable Sage Thrasher Trends in Colorado

long arc increasecomputed index

Sage Thrasher has surged in Colorado: up 798% on the route-weighted index since 1970.

Sage Thrasher Population Forecast in Colorado

If the recent trend holds, Sage Thrasher in Colorado is projected to fall about 13% by 2029 — from 4.5 in 2024 to a central estimate of 3.9 (95% range 0.94–6.9). A 5-year backtest shows a typical error of ±19.7%, with 100% of held-out values landing inside the 95% band.

-13%Change by 2029
3.9Projected 2029 index
0.94–6.995% range
±19.7%Backtest error
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 index95% low95% high
20253.90.936.9
20263.90.936.9
20273.90.936.9
20283.90.946.9
20293.90.946.9

Sage Thrasher Survey Routes in Colorado

Routes recording Sage Thrasher in Colorado.
Walden6220241990
Dinosaur4820241995
Browns Park4620241992
Maybell3720241972
Great Divide3720241974
Powderhorn3220231994
Antonito2820041995
Lay2620241996
Blanca2419871979
Basin2220241995
San Luis2020241991
Mesita1920242005
Mosca1920241992
Wilson Creek1820241990
Moffat1320241970
Doyleville1320241988
Cochetopa Pass1320241998
Yellowjacket Pass1120241999
Westcliffe1020151999
Yampa920231970
Alamosa920241988
Rosevale820242010
Paonia720241992
Lost Lake320231990
De Beque320242024

Sage Thrasher Population Trend in Other States

arizonacaliforniaidahomontananebraskanevadanew-mexiconorth-dakotaoregonsouth-dakotautahwashingtonwyoming

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