| Mark | Athlete | School | Year | Meet |
|---|
| 48.80 | Drew Turner | Glacier (AA) | 12 | State AA |
| 49.16 | Ethan Larson | Glacier (AA) | 12 | Western AA Divisional |
| 49.45 | Mark Estes | Glacier (AA) | 12 | Western AA Divisional |
| 49.55 | Trevin Gradney | Billings West (AA) | 11 | State AA |
| 49.65 | Micah Ans | Billings Senior (AA) | 12 | Midland Roundtable Top 10 |
| 50.08 | Dawson Rinehart | Flathead (AA) | 12 | State AA |
| 50.65 | Ray Trudeau | Helena (AA) | 12 | Western AA Divisional |
| 50.78 | Lucas Gibb | Billings West (AA) | 11 | State AA |
| 51.00 | Payton Ater | Missoula Sentinel (AA) | 9 | MCPS Invite |
| 51.06 | Korben Cossins | Bozeman (AA) | 12 | State AA |
| 51.07 | Kaleb Winterburn | Helena (AA) | 12 | State AA |
| 51.19 | Jonathan Harrison | Missoula Sentinel (AA) | 12 | Western AA Divisional |
| 51.24 | Xavier Melice | Helena Capital (AA) | 12 | Helena Crosstown |
| 51.50 | Chad Hemsley | Flathead (AA) | 12 | Sentinel-Hellgate-Flathead Tri |
| 51.55 | Van Gottwals | Billings West (AA) | 11 | Eastern AA Divisional |
| 51.78 | Taylor Ray | Great Falls CMR (AA) | 12 | Eastern AA Divisional |
| 51.81 | Milo Carpenter | Billings West (AA) | 11 | Midland Roundtable Top 10 |
| 51.81 | Shane Haller | Helena Capital (AA) | 10 | Western AA Divisional |
| 51.98 | Trae Vasquez | Flathead (AA) | 12 | Western AA Divisional |