The Big Sky Conference sponsored men's swimming from 1963-64 until 1973-74.
| Season |
Champion |
| 1963-64 |
Idaho |
| 1964-65 |
Idaho |
| 1965-66 |
Montana |
| 1966-67 |
Montana |
| 1967-68 |
Montana |
| 1968-69 |
Montana |
| 1969-70 |
Montana |
| 1970-71 |
Montana |
| 1971-72 |
Montana |
| 1972-73 |
Montana |
| 1973-74 |
Montana |