Species · Idaho · BBS 2025 Release · 1966–2024
Ruffed Grouse Population Trend in Idaho
Ruffed Grouse in Idaho has declined: down 31% on the route-weighted index since 1978.
-31%Since 1978
21Routes In State
39Years
Notable Ruffed Grouse Trends in Idaho
No notable trend signals for Ruffed Grouse in Idaho. See the full index history below.
Ruffed Grouse Population Forecast in Idaho
If the recent trend holds, Ruffed Grouse in Idaho is projected to fall about 68% by 2029 — from 0.28 in 2024 to a central estimate of 0.09 (95% range 0.00–0.27). A 5-year backtest shows a typical error of ±74.4%, with 80% of held-out values landing inside the 95% band.
-68%Change by 2029
0.09Projected 2029 index
0.00–0.2795% range
±74.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.09 | 0.00 | 0.27 |
| 2026 | 0.09 | 0.00 | 0.27 |
| 2027 | 0.09 | 0.00 | 0.27 |
| 2028 | 0.09 | 0.00 | 0.27 |
| 2029 | 0.09 | 0.00 | 0.27 |
Ruffed Grouse Survey Routes in Idaho
| Cobalt | 4 | 2024 | 2013 |
| Leadore | 2 | 2008 | 2008 |
| Squirrel | 2 | 2022 | 1972 |
| Coolin | 2 | 2024 | 1986 |
| Naples | 1 | 2024 | 1972 |
| Mivoden | 1 | 2023 | 1978 |
| Avery | 1 | 2006 | 1996 |
| Lolo Pass | 1 | 2015 | 1992 |
| Grangeville | 1 | 2010 | 1987 |
| N Fork Cda R | 1 | 2015 | 1994 |
| Rochat Divde | 1 | 2022 | 1997 |
| Centerville | 1 | 2001 | 2001 |
| Magic Mtn | 1 | 2018 | 1998 |
| Marble Creek | 1 | 1998 | 1992 |
| Joel | 1 | 1990 | 1990 |
| Pierce | 1 | 1997 | 1997 |
| Burgdorf | 1 | 2011 | 2011 |
| Yellow Pine | 1 | 2016 | 1989 |
| Featherville | 1 | 2000 | 1996 |
| Bates | 1 | 2009 | 2006 |
| Nezperce Nf | 1 | 1999 | 1999 |
Ruffed Grouse Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.