Species · Idaho · BBS 2025 Release · 1966–2024
Nashville Warbler Population Trend in Idaho
Nashville Warbler in Idaho has surged: up 183% on the route-weighted index since 1977.
+183%Since 1977
29Routes In State
46Years
Notable Nashville Warbler Trends in Idaho
long arc increasecomputed index
Nashville Warbler has surged in Idaho: up 183% on the route-weighted index since 1977.
Nashville Warbler Population Forecast in Idaho
If the recent trend holds, Nashville Warbler in Idaho is projected to rise about 16% by 2029 — from 0.48 in 2024 to a central estimate of 0.56 (95% range 0.07–1.0). A 5-year backtest shows a typical error of ±20.3%, with 80% of held-out values landing inside the 95% band.
+16%Change by 2029
0.56Projected 2029 index
0.07–1.095% range
±20.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.54 | 0.05 | 1.0 |
| 2026 | 0.54 | 0.06 | 1.0 |
| 2027 | 0.55 | 0.06 | 1.0 |
| 2028 | 0.55 | 0.07 | 1.0 |
| 2029 | 0.56 | 0.07 | 1.0 |
Nashville Warbler Survey Routes in Idaho
| Centerville | 13 | 2019 | 1983 |
| Naples | 8 | 2024 | 1972 |
| Lolo Pass | 8 | 2019 | 1992 |
| Sunbeam | 8 | 1994 | 1994 |
| Salmon River | 4 | 2013 | 1991 |
| Rochat Divde | 3 | 2023 | 1994 |
| Challis | 3 | 2021 | 2019 |
| Coolin | 3 | 2024 | 1987 |
| Mivoden | 2 | 2023 | 1977 |
| Nezperce | 2 | 2012 | 1993 |
| Grangeville | 2 | 1995 | 1995 |
| Golden | 2 | 2016 | 1997 |
| Pasadena Val | 2 | 1991 | 1991 |
| Avery | 1 | 2023 | 1990 |
| Gifford | 1 | 2009 | 1989 |
| N Fork Cda R | 1 | 2005 | 1995 |
| Cape Horn | 1 | 2018 | 2018 |
| Triangle | 1 | 2012 | 2008 |
| Glenns Ferry | 1 | 1986 | 1986 |
| Baldy Mountain | 1 | 2015 | 2015 |
| Marble Creek | 1 | 2023 | 1988 |
| Pierce | 1 | 1997 | 1995 |
| Burgdorf | 1 | 2015 | 1989 |
| Cobalt | 1 | 2024 | 2024 |
| Crane Creek | 1 | 2005 | 2004 |
Nashville Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.