Species · Colorado · BBS 2025 Release · 1966–2024
Olive-sided Flycatcher Population Trend in Colorado
Olive-sided Flycatcher in Colorado has declined: down 40% on the route-weighted index since 1970.
-40%Since 1970
79Routes In State
56Years
Notable Olive-sided Flycatcher Trends in Colorado
No notable trend signals for Olive-sided Flycatcher in Colorado. See the full index history below.
Olive-sided Flycatcher Population Forecast in Colorado
If the recent trend holds, Olive-sided Flycatcher in Colorado is projected to rise about 33% by 2029 — from 0.49 in 2024 to a central estimate of 0.66 (95% range 0.06–1.3). A 5-year backtest shows a typical error of ±35%, with 100% of held-out values landing inside the 95% band.
+33%Change by 2029
0.66Projected 2029 index
0.06–1.395% range
±35%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.65 | 0.05 | 1.3 |
| 2026 | 0.65 | 0.05 | 1.3 |
| 2027 | 0.66 | 0.05 | 1.3 |
| 2028 | 0.66 | 0.06 | 1.3 |
| 2029 | 0.66 | 0.06 | 1.3 |
Olive-sided Flycatcher Survey Routes in Colorado
| Buffalo Park | 10 | 2023 | 1992 |
| Dolores | 9 | 1969 | 1969 |
| Stillwater Pass | 7 | 2009 | 2002 |
| Stillwater Pass 2 | 7 | 2024 | 2010 |
| Cheesman Lk | 6 | 2024 | 1969 |
| Red Cliff | 6 | 2023 | 1989 |
| Comanche Pk | 5 | 2024 | 1994 |
| Ragged Mtn. | 5 | 2019 | 1994 |
| Lost Lake | 4 | 2024 | 1994 |
| Blackhead Pk | 4 | 2014 | 1991 |
| Deadman Rd. | 4 | 2023 | 1992 |
| Lake City 2 | 4 | 2022 | 2016 |
| Dolores Riv | 3 | 2024 | 1988 |
| Tincup | 3 | 2024 | 1995 |
| Powderhorn | 3 | 2023 | 2005 |
| South Fork | 3 | 2024 | 1994 |
| Radium | 3 | 2012 | 1998 |
| Cochetopa Pass | 3 | 2024 | 2001 |
| Heeney | 3 | 2019 | 2017 |
| Gold Hill 2 | 3 | 2023 | 2019 |
| Buford | 2 | 2009 | 1980 |
| Pagosa Spgs | 2 | 1982 | 1968 |
| Willow Peak | 2 | 2018 | 1988 |
| Tarryall | 2 | 2023 | 1988 |
| Castleton | 2 | 2022 | 1988 |
Olive-sided Flycatcher Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.