| Mark | Athlete | School | Year | Meet |
|---|
| 44-07.25 | Paul Johnstone | Forsyth (B) | 12 | State B |
| 44-05 | Brett Glaser | Glasgow (B) | 11 | State B |
| 43-02 | Ry Olson | Joliet (B) | 11 | Al Walker Memorial |
| 43-00.75 | Braden Smith | Whitehall (B) | 12 | State B |
| 42-08.25 | Bridger Bell | Loyola Sacred Heart (B) | 12 | KLH Invitational |
| 41-11 | David Koppang | Loyola Sacred Heart (B) | 12 | Seeley-Swan Invitational |
| 41-10 | Taylor Rowlison | Joliet (B) | 12 | Park City/Harlo Invitational |
| 41-08 | Caleb Bailey | Joliet (B) | 10 | Laurel Varsity Invite |
| 41-06.75 | Keenan Reynolds | Huntley Project (B) | 12 | Gallatin Valley Invitational |
| 41-06.5 | Ryan Tirrell | Loyola Sacred Heart (B) | 11 | Western B Divisional |
| 41-05 | Bryce Olson | Three Forks (B) | 11 | Southern B Divisional |
| 41-04.5 | Danny Hoisington | Thompson Falls (B) | 12 | Jim Johnson Track Meet |
| 41-03.75 | Kordel Ellis | Huntley Project (B) | 10 | Billings Invitational |
| 41-03 | Marques White Horse | Wolf Point (B) | 12 | State B |
| 41-01 | Cade Briggs | Whitehall (B) | 11 | John Cheek Top 8 Track and Field Meet |
| 41-00.5 | Nathan Weber | Forsyth (B) | 12 | State B |