| Mark | Athlete | School | Year | Meet |
|---|
| 50.00 | Kougar Kappel | Red Lodge (B) | 11 | Midland Roundtable Top 10 |
| 50.05 | Trizten Avila | Superior (B) | 12 | State B/C Championship |
| 50.19 | Ledger Martin | Conrad (B) | 10 | State B/C Championship |
| 50.37 | Khye Gamas | Glasgow (B) | 11 | State B/C Championship |
| 50.70 | Matthew Tobiason | Loyola Sacred Heart (B) | 12 | State B/C Championship |
| 50.71 | Caleb Stosich | Sweet Grass Co./Big Timber (B) | 12 | Southern B/C Divisional |
| 50.77 | Trent Karst | Fairview (B) | 12 | State B/C Championship |
| 50.90 | Dawson Hammond | Malta (B) | 11 | State B/C Championship |
| 51.05 | Isaac Bates | Florence-Carlton (B) | 12 | Western B/C Divisional |
| 51.15 | Colter Anderson | Sweet Grass Co./Big Timber (B) | 11 | Southern B/C Divisional |
| 51.15 | Josh Lambertsen | Lincoln Co./Eureka (B) | 11 | 7B District Meet |
| 51.16 | Gavin Miller | Darby (B) | 9 | Western B/C Divisional |
| 51.17 | Auston Schellig | Joliet (B) | 11 | 4B District Meet |
| 51.32 | McCoy Townsend | Darby (B) | 11 | Western B/C Divisional |
| 51.54 | Isaiah Gather | Three Forks (B) | 11 | Midland Roundtable Top 10 |
| 51.66 | Brandon Williams | Joliet (B) | 11 | Al Walker Memorial Meet |
| 51.79 | Cole Kramer | Ennis (B) | 12 | Al Walker Memorial Meet |
| 51.95 | Jake Schlothauer | Fairview (B) | 9 | State B/C Championship |