| Mark | Athlete | School | Year | Meet |
|---|
| 49.72 | Treyton Anderson | Beaverhead Co./Dillon (A) | 12 | Park High Class A Meet |
| 50.39 | Treyton Graham | Beaverhead Co./Dillon (A) | 11 | State A |
| 50.91 | Gabe Menicke | Whitefish (A) | 12 | State A |
| 50.94 | Clay Oven | Billings Central (A) | 11 | Midland Roundtable Top 10 |
| 50.98 | Eli Taylor | Hamilton (A) | 11 | State A |
| 51.21 | Colter Kirkland | Hamilton (A) | 12 | Hamilton Quad |
| 51.22 | Kohbe Smith | Dawson Co./Glendive (A) | 10 | State A |
| 51.27 | Malaki Simpson | Columbia Falls (A) | 10 | Western A Divisional |
| 51.33 | Davide Massarutto | Laurel (A) | 12 | State A |
| 51.42 | Garrett Schmill | Frenchtown (A) | 12 | Nelson-Thomas ABC Meet |
| 51.64 | Jeremy Bockus | Browning (A) | 12 | Whitefish-Flathead-Browning Tri |
| 51.74 | Rauly Jessop | Corvallis (A) | 11 | State A |
| 51.89 | Derek Criddle | Corvallis (A) | 10 | Western A Divisional |