Species · Montana · BBS 2025 Release · 1966–2024
Black-billed Cuckoo Population Trend in Montana
Black-billed Cuckoo in Montana has fallen sharply: down 71% on the route-weighted index since 1971.
-71%Since 1971
29Routes In State
37Years
Notable Black-billed Cuckoo Trends in Montana
long arc declinecomputed index
Black-billed Cuckoo has fallen sharply in Montana: down 71% on the route-weighted index since 1971.
Black-billed Cuckoo Population Forecast in Montana
If the recent trend holds, Black-billed Cuckoo in Montana is projected to fall about 100% by 2028 — from 0.08 in 2023 to a central estimate of 0.00 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±246.8%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2028
0.00Projected 2028 index
0.00–0.2395% range
±246.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.00 | 0.00 | 0.23 |
| 2025 | 0.00 | 0.00 | 0.23 |
| 2026 | 0.00 | 0.00 | 0.23 |
| 2027 | 0.00 | 0.00 | 0.23 |
| 2028 | 0.00 | 0.00 | 0.23 |
Black-billed Cuckoo Survey Routes in Montana
| Brandenberg | 8 | 1981 | 1969 |
| Chuffey Spring | 6 | 2023 | 2023 |
| Savage | 3 | 1978 | 1978 |
| Willow Creek 2 | 2 | 2014 | 1983 |
| St Mary | 1 | 1989 | 1989 |
| Cleveland | 1 | 1983 | 1983 |
| Harlem | 1 | 1980 | 1980 |
| Glasgow | 1 | 2000 | 1989 |
| Oswego | 1 | 2012 | 2012 |
| Bull Mtn. | 1 | 1995 | 1995 |
| Augusta | 1 | 1981 | 1977 |
| Highwood | 1 | 2012 | 1989 |
| Jordan | 1 | 1994 | 1994 |
| Circle | 1 | 2002 | 1979 |
| Flatwillow | 1 | 1989 | 1968 |
| Ingomar | 1 | 1978 | 1968 |
| Forsyth | 1 | 1991 | 1989 |
| Locate | 1 | 2008 | 1984 |
| Webster | 1 | 1989 | 1979 |
| Twin Bridges | 1 | 1976 | 1968 |
| Willow Creek | 1 | 1978 | 1973 |
| Chestnut | 1 | 1989 | 1968 |
| Reed Point | 1 | 1992 | 1977 |
| Laurel | 1 | 1997 | 1975 |
| St Xavier | 1 | 1994 | 1982 |
Black-billed Cuckoo Population Trend in Other States
alabamaarkansascoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.