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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 1970 | Billings Mustangs | 3.50 | .247 | PION |
| 1971 | Billings Mustangs | 4.28 | .260 | PION |
| 1972 | Bozeman Preachers | 4.46 | .267 | PION |
| 1973 | Ogden Spikes | 4.65 | .269 | PION |
| 1974 | Billings Mustangs | 3.88 | .251 | PION |
| 1975 | Bozeman Pheasants | 3.94 | .253 | PION |
| 1976 | Ogden Spikes | 4.14 | .253 | PION |
| 1977 | Butte Copper Kings | 3.94 | .245 | PION |
| 1978 | Minot Jets | 4.30 | .251 | PION |
| 1979 | Butte Copper Kings | 3.97 | .247 | PION |
| 1980 | Bozeman Pheasants | 3.77 | .241 | PION |
| 1981 | Bozeman Pheasants | 4.57 | .258 | PION |
