Species · Montana · BBS 2025 Release · 1966–2024
Greater Sage-Grouse Population Trend in Montana
Greater Sage-Grouse in Montana has collapsed: down 79% on the route-weighted index since 1971.
-79%Since 1971
23Routes In State
51Years
Notable Greater Sage-Grouse Trends in Montana
long arc declinecomputed index
Greater Sage-Grouse has collapsed in Montana: down 79% on the route-weighted index since 1971.
Greater Sage-Grouse Population Forecast in Montana
If the recent trend holds, Greater Sage-Grouse in Montana is projected to fall about 87% by 2029 — from 0.12 in 2024 to a central estimate of 0.01 (95% range 0.00–0.78). A 5-year backtest shows a typical error of ±187.8%, with 100% of held-out values landing inside the 95% band.
-87%Change by 2029
0.01Projected 2029 index
0.00–0.7895% range
±187.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.05 | 0.00 | 0.82 |
| 2026 | 0.04 | 0.00 | 0.81 |
| 2027 | 0.03 | 0.00 | 0.80 |
| 2028 | 0.03 | 0.00 | 0.79 |
| 2029 | 0.01 | 0.00 | 0.78 |
Greater Sage-Grouse Survey Routes in Montana
| Roy | 12 | 2021 | 1988 |
| Ingomar | 6 | 2024 | 1970 |
| Beaverhead | 5 | 1988 | 1988 |
| Jordan | 4 | 2017 | 1968 |
| Circle | 4 | 1977 | 1972 |
| Shawmut | 4 | 1988 | 1979 |
| Powderville | 3 | 2024 | 1971 |
| Jordan South | 3 | 2021 | 2016 |
| Pryor Mtn. | 2 | 2015 | 2007 |
| Boulder | 2 | 1971 | 1971 |
| St Xavier | 2 | 1988 | 1980 |
| Cleveland | 1 | 1987 | 1987 |
| Malta | 1 | 2021 | 1975 |
| Oswego | 1 | 1983 | 1983 |
| Leroy | 1 | 2012 | 1980 |
| Brusett | 1 | 2018 | 1983 |
| Flatwillow | 1 | 2006 | 1970 |
| Forsyth | 1 | 1989 | 1988 |
| Laurel | 1 | 1984 | 1984 |
| Brandenberg | 1 | 1972 | 1968 |
| Albion | 1 | 2012 | 1982 |
| Roundup | 1 | 2019 | 2016 |
| Miles City | 1 | 2024 | 2021 |
Greater Sage-Grouse Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.