Species · Montana · BBS 2025 Release · 1966–2024
Fox Sparrow Population Trend in Montana
Fox Sparrow in Montana has surged: up 232% on the route-weighted index since 1971.
+232%Since 1971
22Routes In State
50Years
Notable Fox Sparrow Trends in Montana
long arc increasecomputed index
Fox Sparrow has surged in Montana: up 232% on the route-weighted index since 1971.
Fox Sparrow Population Forecast in Montana
If the recent trend holds, Fox Sparrow in Montana is projected to fall about 18% by 2029 — from 0.67 in 2024 to a central estimate of 0.55 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±21%, with 100% of held-out values landing inside the 95% band.
-18%Change by 2029
0.55Projected 2029 index
0.00–1.195% range
±21%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.53 | 0.00 | 1.1 |
| 2026 | 0.54 | 0.00 | 1.1 |
| 2027 | 0.54 | 0.00 | 1.1 |
| 2028 | 0.54 | 0.00 | 1.1 |
| 2029 | 0.55 | 0.00 | 1.1 |
Fox Sparrow Survey Routes in Montana
| Logan Pass | 20 | 2024 | 1980 |
| Whitefish Lake | 17 | 2024 | 2016 |
| Inside Road | 4 | 2024 | 1990 |
| Fish Creek | 4 | 2024 | 2022 |
| Hebgen Lake | 4 | 2024 | 2019 |
| Chestnut | 3 | 2009 | 1999 |
| Libby Dam | 2 | 2024 | 1984 |
| Woodman | 2 | 2024 | 1969 |
| Sula | 2 | 2024 | 1977 |
| Noxon | 2 | 2011 | 2011 |
| St Mary | 1 | 1989 | 1989 |
| Pryor Mtn. | 1 | 2018 | 2001 |
| St Regis | 1 | 2024 | 2002 |
| Arlee | 1 | 2024 | 1970 |
| Clinton | 1 | 2001 | 2001 |
| Elliston | 1 | 1974 | 1974 |
| East Glacier Park | 1 | 2022 | 2015 |
| Red Rock | 1 | 1989 | 1989 |
| Skalkho-Rye | 1 | 2010 | 2000 |
| Swan Lake | 1 | 2021 | 2017 |
| Ninemile | 1 | 2018 | 1999 |
| Painted Rock | 1 | 2019 | 2015 |
Fox Sparrow Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.