| Mark | School | Meet |
|---|
| 48.65 | Billings Senior (AA) | State AA Track Meet |
| 48.76 | Great Falls CMR (AA) | State AA Track Meet |
| 49.52 | Missoula Big Sky (AA) | Western AA Divisional |
| 49.59 | Billings Skyview (AA) | Midland Roundtable Top 10 Meet |
| 50.06 | Missoula Sentinel (AA) | State AA Track Meet |
| 50.30 | Butte (AA) | Butte Quad |
| 50.33 | Flathead (AA) | Flathead-Glacier Dual |
| 50.48 | Belgrade (AA) | Central A Divisional |
| 50.62 | Billings West (AA) | State AA Track Meet |
| 50.68 | Helena (AA) | State AA Track Meet |
| 50.95 | Helena Capital (AA) | Western AA Divisional |
| 51.71 | Missoula Hellgate (AA) | Missoula Quad |
| 51.74 | Glacier (AA) | Whitefish A.R.M. Invitational |
| 52.16 | Great Falls (AA) | Eastern AA Divisional |
| 52.23 | Bozeman (AA) | Midland Roundtable Top 10 Meet |