| Mark | Athlete | School | Year | Meet |
|---|
| 48.98 | Jaden Foster | Missoula Sentinel (AA) | 11 | State AA |
| 49.19 | Kameron Rauser | Broadwater/Townsend (B) | 12 | State B |
| 49.21 | Dylan Cervelli | Beaverhead Co./Dillon (A) | 12 | State A |
| 49.48 | Hunter Leighty | Troy (B) | 12 | State B |
| 49.50 | Trevin Gradney | Billings West (AA) | 12 | State AA |
| 49.65 | Casey Gunlikson | Sweet Grass Co./Big Timber (B) | 12 | State B |
| 49.74 | Jack Waddell | Park/Livingston (A) | 10 | State A |
| 49.77 | Martin Farver | Scobey (C) | 12 | State C |
| 49.82 | Hunter Shelmerdine | Seeley-Swan (C) | 12 | KLH Memorial Track Meet |
| 49.95 | Mitchell Burns | Huntley Project (B) | 10 | State B |
| 49.97 | Jay Beagle | Libby (A) | 10 | State A |
| 50.00 | Lee Walburn | Whitefish (A) | 12 | State A |
| 50.53 | Tommy Mellott | Butte (AA) | 11 | State AA |
| 50.55 | Sean Hegstad | Glacier (AA) | 12 | State AA |
| 50.56 | Cutter Thatcher | Butte Central (A) | 11 | State A |
| 50.64 | Tyler Rued | Bozeman (AA) | 12 | State AA |
| 50.71 | Drew Morgan | Columbia Falls (A) | 12 | State A |
| 50.79 | Drew Deck | Glacier (AA) | 11 | Glacier Cinco |
| 50.93 | Taggert Devaney | Laurel (A) | 11 | State A |
| 50.99 | Ty Henry Steele | Broadwater/Townsend (B) | 10 | State B |
| 51.19 | Kaiden Romney | Frenchtown (A) | 11 | KLH Memorial Track Meet |
| 51.36 | Kaimen Evans | Belt (C) | 10 | Cascade Top 8 |
| 51.42 | Hunter Mahan | Loyola Sacred Heart (B) | 11 | State B |
| 51.45 | Jess Bellows | Custer Co./Miles City (A) | 11 | Midland Roundtable Top 10 |
| 51.48 | Michael Pugh | Malta (B) | 12 | State B |
| 51.53 | Zane Newman | Broadwater/Townsend (B) | | State B |
| 51.53 | Wyatt Barney | Manhattan (B) | 10 | CMR Quadrangular |
| 51.54 | Boston Goode | Polson (A) | | State A |
| 51.54 | Rafe Premo | Great Falls CMR (AA) | 9 | Great Falls City Meet |
| 51.57 | Bryce Nelson | Great Falls CMR (AA) | 11 | CMR Quadrangular |
| 51.60 | Nick Page | Wolf Point (B) | 11 | State B |
| 51.60 | Caleb Bellach | Manhattan Christian (C) | 12 | State C |
| 51.64 | Benjamin Tuinstra | Valley Christian (C) | 12 | State C |
| 51.64 | Jacob Vetter | Butte (AA) | 12 | Eastern AA Divisionals |
| 51.69 | Ben Maehl | Missoula Big Sky (AA) | 11 | State AA |
| 51.69 | Brock Smith | Billings West (AA) | 12 | Billings City Meet |
| 51.72 | Hunter Bear Cloud | Hardin (A) | 10 | John Polich Invitational |
| 51.83 | Brandon Machart | Scobey (C) | 12 | State C |
| 51.87 | Dylan Taylor | Denton-Geyser-Stanford (C) | 11 | Fairfield-Belt Invite #2 |
| 51.89 | Van Gottwals | Billings West (AA) | 12 | State AA |
| 51.90 | Paul Little Light | Hardin (A) | | State A |
| 51.92 | Ty Henry Steele | Broadwater/Townsend (B) | 10 | KLH Memorial Track Meet |
| 51.97 | Justus Peterson | Beaverhead Co./Dillon (A) | 11 | Western A Divisionals |
| 52.26 | Garrett Zimdars | Park City (B) | | State C |