Species · Idaho · BBS 2025 Release · 1966–2024
Swainson's Hawk Population Trend in Idaho
Swainson's Hawk in Idaho has surged: up 622% on the route-weighted index since 1972.
+622%Since 1972
37Routes In State
52Years
Notable Swainson's Hawk Trends in Idaho
long arc increasecomputed index
Swainson's Hawk has surged in Idaho: up 622% on the route-weighted index since 1972.
Swainson's Hawk Population Forecast in Idaho
If the recent trend holds, Swainson's Hawk in Idaho is projected to rise about 70% by 2029 — from 1.7 in 2024 to a central estimate of 2.9 (95% range 1.7–4.2). A 5-year backtest shows a typical error of ±41.1%, with 40% of held-out values landing inside the 95% band.
+70%Change by 2029
2.9Projected 2029 index
1.7–4.295% range
±41.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 2.7 | 1.5 | 4.0 |
| 2026 | 2.8 | 1.5 | 4.0 |
| 2027 | 2.8 | 1.6 | 4.1 |
| 2028 | 2.9 | 1.6 | 4.1 |
| 2029 | 2.9 | 1.7 | 4.2 |
Swainson's Hawk Survey Routes in Idaho
| Acequia | 29 | 2012 | 1987 |
| Picabo | 21 | 2021 | 1990 |
| Pocatello | 20 | 2019 | 1980 |
| Mud Lake | 14 | 2023 | 1988 |
| Bates | 12 | 2023 | 1988 |
| Cedar Hill | 12 | 2024 | 1990 |
| Dubois | 10 | 2024 | 1972 |
| Twin Buttes | 9 | 2024 | 1985 |
| Ririe | 6 | 2023 | 1987 |
| Squirrel | 5 | 2024 | 1972 |
| Blacks Creek | 5 | 2017 | 1968 |
| Preston | 4 | 2023 | 1988 |
| Tractor Flat | 3 | 2024 | 1985 |
| Craters | 3 | 2018 | 1979 |
| Sawtooth City 2 | 3 | 2023 | 2015 |
| Crane Creek | 3 | 2019 | 1988 |
| Daniels Res | 3 | 2019 | 1991 |
| Kyle Canyon | 2 | 2024 | 1985 |
| Cascade | 2 | 1982 | 1972 |
| Springfield | 2 | 2018 | 1971 |
| Triangle | 2 | 2021 | 2021 |
| Henry | 2 | 1983 | 1979 |
| Joel | 2 | 1999 | 1998 |
| Silver City | 2 | 2019 | 2019 |
| Carey | 2 | 2014 | 1989 |
Swainson's Hawk Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.