Species · Montana · BBS 2025 Release · 1966–2024
American Bittern Population Trend in Montana
American Bittern in Montana has edged down: down 13% on the route-weighted index since 1970.
-13%Since 1970
19Routes In State
45Years
Notable American Bittern Trends in Montana
No notable trend signals for American Bittern in Montana. See the full index history below.
American Bittern Population Forecast in Montana
If the recent trend holds, American Bittern in Montana is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±111.1%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.00Projected 2029 index
0.00–0.1595% range
±111.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.01 | 0.00 | 0.15 |
| 2026 | 0.00 | 0.00 | 0.15 |
| 2027 | 0.00 | 0.00 | 0.15 |
| 2028 | 0.00 | 0.00 | 0.15 |
| 2029 | 0.00 | 0.00 | 0.15 |
American Bittern Survey Routes in Montana
| Webster | 3 | 2023 | 2003 |
| Kalispell | 2 | 2024 | 1968 |
| Ester Lake | 2 | 2023 | 2016 |
| Westby | 2 | 2023 | 2023 |
| St Mary | 1 | 1995 | 1976 |
| Flatwillow 2 | 1 | 2018 | 2018 |
| Cleveland | 1 | 2017 | 1979 |
| Malta | 1 | 2023 | 1976 |
| Redstone | 1 | 1979 | 1976 |
| Roy | 1 | 2019 | 2019 |
| Brusett | 1 | 1982 | 1982 |
| Ingomar | 1 | 1980 | 1980 |
| St Xavier | 1 | 1996 | 1996 |
| Powderville | 1 | 1974 | 1970 |
| Albion | 1 | 2008 | 2008 |
| Beaverhead | 1 | 2024 | 1986 |
| Winnett | 1 | 2023 | 2018 |
| Lindsay | 1 | 2018 | 2018 |
| Pablo Res. | 1 | 1995 | 1995 |
American Bittern Population Trend in Other States
alaskacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaslouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.