| Mark | Athlete | School | Year | Meet |
|---|
| 39.79 | Lee Walburn | Whitefish (A) | 11 | Western A Divisional |
| 39.92 | Ivar Aageson | Havre (A) | 12 | State A |
| 39.95 | Kaden Stradley | Custer Co./Miles City (A) | 11 | State A |
| 40.18 | Justus Peterson | Beaverhead Co./Dillon (A) | 10 | Western A Divisional |
| 40.25 | Colton Cote | Polson (A) | 12 | State A |
| 40.69 | Malik Toure | Hardin (A) | 12 | Eastern A Divisional |
| 40.96 | Chris Abell | Laurel (A) | 11 | John Polich Invitational |
| 41.17 | Malik Toure | Hardin (A) | 12 | Colstrip Invite |
| 41.44 | Logan Peila | Custer Co./Miles City (A) | 10 | Eastern A Divisional |
| 41.86 | Aidan Barrows | Custer Co./Miles City (A) | 10 | Eastern A Divisional |