Species · Colorado · BBS 2025 Release · 1966–2024
Common Poorwill Population Trend in Colorado
Common Poorwill in Colorado has edged down: down 16% on the route-weighted index since 1972.
-16%Since 1972
35Routes In State
47Years
Notable Common Poorwill Trends in Colorado
No notable trend signals for Common Poorwill in Colorado. See the full index history below.
Common Poorwill Population Forecast in Colorado
If the recent trend holds, Common Poorwill in Colorado is projected to fall about 50% by 2029 — from 0.08 in 2024 to a central estimate of 0.04 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±43.7%, with 80% of held-out values landing inside the 95% band.
-50%Change by 2029
0.04Projected 2029 index
0.00–0.0995% range
±43.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 0.09 |
| 2026 | 0.04 | 0.00 | 0.09 |
| 2027 | 0.04 | 0.00 | 0.09 |
| 2028 | 0.04 | 0.00 | 0.09 |
| 2029 | 0.04 | 0.00 | 0.09 |
Common Poorwill Survey Routes in Colorado
| Great Divide | 2 | 2022 | 2010 |
| Uncompahgre | 2 | 2024 | 1990 |
| Lay | 2 | 2024 | 2000 |
| Gold Hill 2 | 2 | 2024 | 2024 |
| Deadman Rd. | 2 | 2005 | 1992 |
| Maybell | 1 | 2021 | 1975 |
| Yampa | 1 | 1986 | 1986 |
| Briggsdale | 1 | 1968 | 1968 |
| Mesaverde Np | 1 | 2023 | 2023 |
| Douglas Pass | 1 | 1997 | 1997 |
| Kiowa | 1 | 2013 | 1988 |
| Delta | 1 | 2009 | 2009 |
| Mica Butte | 1 | 1982 | 1972 |
| Gilpin | 1 | 1971 | 1971 |
| Wray Gulch | 1 | 2016 | 1992 |
| Wilson Creek | 1 | 2004 | 1996 |
| Willow Peak | 1 | 2017 | 1997 |
| Dinosaur | 1 | 2002 | 2002 |
| Doyleville | 1 | 2006 | 2006 |
| Baxter Pass | 1 | 2024 | 1994 |
| Powderhorn | 1 | 2022 | 1997 |
| Browns Park | 1 | 2015 | 1997 |
| Dunckley Pas | 1 | 2009 | 1998 |
| Buffalo Park | 1 | 2023 | 2006 |
| Flattops | 1 | 2015 | 2013 |
Common Poorwill Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.