| Mark | Athlete | School | Year | Meet |
|---|
| 47.75 | Connor Matthews | Helena (AA) | 12 | State AA |
| 48.36 | Kelly Murnion | Garfield Co./Jordan (C) | 12 | Southern C Divisional |
| 48.89 | Tyler McQueen | Billings Senior (AA) | 12 | State AA |
| 48.99 | Bill Yeager | Twin Bridges (C) | 12 | State C |
| 49.02 | Simon Petsch | Billings West (AA) | 11 | State AA |
| 49.28 | Dawson LaRance | Billings Senior (AA) | 11 | Butte Invite |
| 49.35 | Caleb Neth | Manhattan (B) | 12 | Butte Invite |
| 49.86 | Scout Willcut | Glacier (AA) | 11 | State AA |
| 50.09 | Koltin Haugrose | Belt (C) | 12 | State C |
| 50.10 | Rahkei Eyer | Jefferson/Boulder (B) | 12 | State B |
| 50.12 | Cade Johnstone | Forsyth (C) | 10 | State B |
| 50.14 | Bruce Thomas | Corvallis (A) | 11 | Western A Divisionals |
| 50.17 | Zander Mozer | Helena (AA) | 11 | State AA |
| 50.21 | Nolan Jenko | Missoula Big Sky (AA) | 12 | State AA |
| 50.33 | Nate Rismon | Havre (A) | 12 | State A |
| 50.35 | Isaac Desjarlais | Arlee (C) | 12 | KLH Memorial |
| 50.43 | Mike Loftus | Havre (A) | 11 | Eastern A Divisional |
| 50.49 | Tanner Dana | Columbia Falls (A) | 12 | Western A Divisionals |
| 50.50 | Sean Opland | Troy (B) | 12 | State B |
| 50.74 | Danny Burton | Helena Capital (AA) | 12 | Great Falls Triangular 5/7 |
| 50.77 | Tyler Gurchiek | Billings West (AA) | 11 | Eastern AA Divisionals |
| 50.78 | Naquan Williams | Bozeman (AA) | 12 | Eastern AA Divisionals |
| 50.83 | Jacob Grinwis | Belgrade (AA) | 11 | MidLand Round Table Top Ten |
| 50.93 | Cleet Wrzesinski | Ennis (B) | 11 | Manhattan Invitational |
| 50.94 | Trace Jones | Sidney (A) | 11 | John Polich Cowgirl/Cowboy Invitational Track Meet |
| 51.01 | Conner Cross | Manhattan (B) | 12 | Manhattan Christian Invitational |
| 51.06 | Carl Evans | Bozeman (AA) | 12 | Eastern AA Divisionals |
| 51.07 | Hunter Casey | Stevensville (A) | 12 | Polson ABC Meet |
| 51.08 | Tyler Combs | Glacier (AA) | 11 | Western AA Divisional |
| 51.09 | Damon Adams | Harlem (B) | 11 | State B |
| 51.11 | Matt Farrier | Bigfork (A) | 11 | State B |
| 51.20 | Mark Estes | Drummond (C) | 10 | Big Sky 5 Team |
| 51.29 | Shane Milton | Joliet (B) | 11 | State B |
| 51.32 | Camren Kovarik | Missoula Sentinel (AA) | 11 | MCPS Invite |
| 51.36 | Bryar Lange | Savage (C) | 11 | Eastern C Divisional |
| 51.50 | Jered Padmos | Jefferson/Boulder (B) | 12 | KLH Memorial |
| 51.54 | Mathew Rensvold | Polson (A) | 11 | Western A Divisionals |
| 51.58 | Milo Carpenter | Laurel (A) | 9 | Eastern A Divisional |
| 51.69 | Ryan McNamara | Helena (AA) | 12 | Western AA Divisional |
| 51.73 | Kendrick Schell | Billings Skyview (AA) | 12 | Eastern AA Divisionals |
| 51.90 | Bradey Wilson | Noxon (C) | 12 | State C |
| 51.91 | Eddie Harmon | Turner (C) | 10 | State C |
| 51.95 | Moritz Little | Red Lodge (B) | 12 | Southern B Divisional |
| 52.00 | Jacob Labrie | Havre (A) | 11 | Havre Quad |