| Mark | School | Meet |
|---|
| 48.28 | Billings West (AA) | Midland Roundtable Top 10 |
| 49.01 | Missoula Hellgate (AA) | Archie Roe Invitational |
| 49.09 | Billings Senior (AA) | Midland Roundtable Top 10 |
| 49.32 | Helena (AA) | Helena Crosstown Meet |
| 49.58 | Belgrade (AA) | Eastern AA Divisional |
| 49.67 | Gallatin (Bozeman) (AA) | Last Chance Qualifier |
| 49.70 | Glacier (AA) | Columbia Falls/Glacier Dual |
| 50.17 | Great Falls (AA) | Skor Dekam Invite |
| 50.84 | Missoula Big Sky (AA) | Big Sky Quad |
| 50.92 | Bozeman (AA) | Midland Roundtable Top 10 |
| 51.00 | Butte (AA) | Western AA Divisional |
| 51.02 | Great Falls CMR (AA) | Eastern AA Divisional |
| 51.08 | Helena Capital (AA) | Helena Crosstown Meet |
| 51.33 | Missoula Sentinel (AA) | Western AA Divisional |
| 51.38 | Billings Skyview (AA) | Eastern AA Divisional |
| 51.68 | Flathead (AA) | Archie Roe Invitational |