Species · Colorado · BBS 2025 Release · 1966–2024
Hermit Thrush Population Trend in Colorado
Hermit Thrush in Colorado has surged: up 277% on the route-weighted index since 1970.
+277%Since 1970
81Routes In State
56Years
Notable Hermit Thrush Trends in Colorado
long arc increasecomputed index
Hermit Thrush has surged in Colorado: up 277% on the route-weighted index since 1970.
Hermit Thrush Population Forecast in Colorado
If the recent trend holds, Hermit Thrush in Colorado is projected to rise about 41% by 2029 — from 4.6 in 2024 to a central estimate of 6.5 (95% range 4.6–8.4). A 5-year backtest shows a typical error of ±37.2%, with 20% of held-out values landing inside the 95% band.
+41%Change by 2029
6.5Projected 2029 index
4.6–8.495% range
±37.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 6.1 | 4.2 | 8.0 |
| 2026 | 6.2 | 4.3 | 8.1 |
| 2027 | 6.3 | 4.4 | 8.2 |
| 2028 | 6.4 | 4.5 | 8.3 |
| 2029 | 6.5 | 4.6 | 8.4 |
Hermit Thrush Survey Routes in Colorado
| Buffalo Park | 77 | 2023 | 1992 |
| Pinos Creek | 44 | 1990 | 1988 |
| Mount Evans | 34 | 2024 | 1996 |
| South Fork | 33 | 2024 | 1994 |
| Haycamp Mesa | 32 | 2024 | 1998 |
| Mcphee Res. | 27 | 2024 | 1996 |
| Baxter Pass | 25 | 2024 | 1994 |
| Cochetopa Pass | 25 | 2024 | 1998 |
| Pinon | 24 | 2024 | 1992 |
| Lake City | 22 | 2003 | 1988 |
| Rollins Pass | 22 | 2022 | 1998 |
| Deadman Rd. | 20 | 2024 | 1992 |
| Dunckley Pas | 17 | 2024 | 1992 |
| Owl Creek Pass | 16 | 2024 | 1998 |
| Lizard Head Pass | 16 | 2024 | 2001 |
| Uncompahgre | 15 | 2024 | 1988 |
| Guanella Pas | 15 | 2024 | 1992 |
| Dolores Riv | 14 | 2024 | 1988 |
| Lake City 2 | 14 | 2024 | 2016 |
| Weston Pass | 14 | 2000 | 1994 |
| Stillwater Pass | 14 | 2009 | 2005 |
| Nucla | 14 | 2024 | 1999 |
| Como | 13 | 2024 | 1994 |
| Moon Pass | 12 | 2024 | 1998 |
| Lost Lake | 10 | 2024 | 1990 |
Hermit Thrush Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.