| Mark | Athlete | School | Year | Meet |
|---|
| 49.29 | Jadin Casey | Stevensville (A) | 12 | Southwestern A Divisional |
| 49.48 | Brock Butcher | Fergus/Lewistown (A) | 12 | Midland Roundtable Top 10 |
| 49.88 | Taylor Sylvester | Corvallis (A) | 12 | State A |
| 50.36 | Michael Gulledge | Billings Central (A) | 12 | State A |
| 50.60 | Karill Apedaile | Hamilton (A) | 12 | John Tomich Invitational |
| 50.90 | Dakota Pew | Dawson Co./Glendive (A) | 12 | Jock Stop Invitational |
| 50.97 | Brian Fauntleroy | Whitefish (A) | 11 | Northwestern A Divisional |
| 51.18 | Nate Rismon | Havre (A) | 11 | Whitefish ARM Invitational |
| 51.26 | Daniel Pendergast | Stevensville (A) | 12 | Southwestern A Divisional |
| 51.34 | Tanner Dana | Columbia Falls (A) | 11 | Glacier-Columbia Falls Dual |
| 51.47 | Robert Jones | Frenchtown (A) | 12 | Northwestern A Divisional |
| 51.66 | Luke Cardon | Whitefish (A) | 12 | Northwestern A Divisional |
| 51.67 | Josh Moore | Corvallis (A) | 12 | State A |
| 51.75 | Brandon Kubitz | Laurel (A) | 12 | Jock Stop Invitational |
| 51.86 | Jed Nagler | Whitefish (A) | 11 | Columbia Falls-Whitefish Dual |