| Mark | Athlete | School | Year | Meet |
|---|
| 38.51 | William Hollensteiner | Flathead (AA) | 11 | Western AA Divisional |
| 38.64 | Ethan Anderson | Glacier (AA) | 12 | Archie Roe Invitational |
| 39.03 | Lane Chivers | Flathead (AA) | 12 | MCPS Invitational |
| 39.27 | Cormack Batt | Missoula Big Sky (AA) | 11 | Russ Plicher Western Top 10 |
| 39.70 | Merek Mihelish | Helena Capital (AA) | 12 | Helena Crosstown Meet |
| 39.81 | Jameson Canney | Helena Capital (AA) | 11 | Skor Dekam Invite |
| 40.09 | Caleb Litzinger | Great Falls (AA) | 12 | Eastern AA Divisional |
| 40.27 | Reese Dahlke | Gallatin (Bozeman) (AA) | 12 | Eastern AA Divisional |
| 40.39 | Kellan Krueger | Missoula Big Sky (AA) | 11 | Missoula "Greg Rice" City Meet |
| 40.62 | Oliver Mow | Helena Capital (AA) | 10 | Helena Crosstown Meet |
| 40.64 | Grayson Kiser | Great Falls (AA) | 12 | Great Falls/Helena Dual |
| 40.67 | Mark Ahner | Glacier (AA) | 12 | Western AA Divisional |
| 40.78 | Carter Dahlke | Gallatin (Bozeman) (AA) | 11 | Last Chance Qualifier |
| 40.89 | Brett Chivers | Flathead (AA) | 10 | Western AA Divisional |
| 40.91 | Cooper Pelc | Glacier (AA) | 10 | Columbia Falls/Glacier Dual |
| 41.16 | Carter Petre | Helena (AA) | 12 | Western AA Divisional |
| 41.28 | Bladen Madel | Great Falls (AA) | 11 | Eastern AA Divisional |
| 41.44 | Liam Palmer | Glacier (AA) | 9 | Archie Roe Invitational |
| 41.70 | Trae Headlee | Billings Skyview (AA) | 12 | Skyview/Bozeman/Belgrade Tri |
| 41.71 | Seth Kiser | Helena (AA) | 10 | Western AA Divisional |
| 41.72 | Tevin Keller | Billings Senior (AA) | 12 | Eastern AA Divisional |
| 41.74 | Jayce Eby | Missoula Sentinel (AA) | 10 | Western AA Divisional |