| Mark | Athlete | School | Year | Meet |
|---|
| 39.06 | Tyler Gilman | Gallatin (Bozeman) (AA) | 12 | State AA |
| 39.23 | Garret Coley | Gallatin (Bozeman) (AA) | 12 | Eastern AA Divisional |
| 39.39 | Drew Klumph | Missoula Sentinel (AA) | 12 | State AA |
| 39.52 | Caleb Bernhardt | Glacier (AA) | 12 | State AA |
| 39.85 | Colter Petre | Helena (AA) | 11 | State AA |
| 40.40 | Nash Coley | Gallatin (Bozeman) (AA) | 10 | State AA |
| 40.66 | Ethan Anderson | Glacier (AA) | 9 | Glacier-Columbia Falls Dual |
| 41.12 | Mitchell Fogelsong | Billings West (AA) | 11 | State AA |
| 41.18 | Fogaa Fatupaito | Billings Skyview (AA) | 11 | State AA |
| 41.23 | Matthew Moreni | Helena Capital (AA) | 11 | Helena Crosstown Dual |
| 41.38 | Jackson Simonson | Great Falls CMR (AA) | 12 | State AA |
| 41.41 | Morgan McClernan | Butte (AA) | 12 | Butte-Bozeman-Gallatin Tri |
| 41.71 | Corbin Weltzien | Missoula Hellgate (AA) | 9 | Greg Rice City Meet |
| 41.73 | Holt Downey | Butte (AA) | 12 | Russ Plicher Top 10 |
| 41.91 | Evan Barnes | Glacier (AA) | 10 | Glacier-Columbia Falls Dual |
| 41.92 | Tuff Adams | Helena Capital (AA) | 10 | Russ Plicher Top 10 |