| Mark | Athlete | School | Year | Meet |
|---|
| 50.04 | Brock Butcher | Fergus/Lewistown (A) | 11 | State A |
| 50.55 | Jadin Casey | Stevensville (A) | 11 | Southwestern A Divisional |
| 50.69 | Karill Apendaile | Hamilton (A) | 11 | Southwestern A Divisional |
| 50.96 | Taylor Sylvester | Corvallis (A) | 11 | Polson ABC Meet |
| 51.05 | Michael Gulledge | Billings Central (A) | 11 | Eastern A Divisional |
| 51.21 | Chris Lords | Stevensville (A) | 12 | State A |
| 51.48 | Caleb Benson | Sidney (A) | 12 | Eastern A Divisional |
| 51.75 | Dakota Pew | Dawson Co./Glendive (A) | 11 | Eastern A Divisional |
| 51.75 | Daniel Pendergast | Stevensville (A) | 11 | Southwestern A Divisional |
| 51.81 | Luke Cardon | Whitefish (A) | 11 | State A |