| Mark | Athlete | School | Year | Meet |
|---|
| 48.23 | William Hollensteiner | Flathead (AA) | 10 | State AA Championship |
| 48.64 | Wilson Schmidt | Belgrade (AA) | 10 | State AA Championship |
| 48.87 | Jackson Tarver | Great Falls CMR (AA) | 12 | Eastern AA Divisional |
| 49.00 | Nash Coley | Gallatin (Bozeman) (AA) | 12 | State AA Championship |
| 49.23 | Derek Criddle | Corvallis (A) | 12 | State A Championship |
| 49.27 | Kohbe Smith | Dawson Co./Glendive (A) | 12 | Glendive Shriners Invitational |
| 49.35 | Titus Sykes | Bozeman (AA) | 12 | State AA Championship |
| 49.61 | Peyton Nelson | Helena Capital (AA) | 12 | State AA Championship |
| 49.61 | Lane Chivers | Flathead (AA) | 11 | Western AA Divisionals |
| 49.73 | Evan Bennett | Hamilton (A) | 11 | State A Championship |
| 49.78 | Carson Krack | Whitefish (A) | 12 | State A Championship |
| 49.83 | Luke Ruch | Helena (AA) | 11 | State AA Championship |
| 49.98 | Osker Patterson | Gallatin (Bozeman) (AA) | 12 | Eastern AA Divisional |
| 50.43 | Reid Bartholomew | Gallatin (Bozeman) (AA) | 10 | State AA Championship |
| 50.43 | Kougar Kappel | Red Lodge (B) | 10 | Southern B Divisional |
| 50.44 | Jack Phelps | Columbia Falls (A) | 11 | Archie Roe Invitational |
| 50.44 | Caleb Conver | Billings West (AA) | 11 | State AA Championship |
| 50.50 | Isaac Bates | Florence-Carlton (B) | 11 | State B Championship |
| 50.50 | Ryan Harrington | Great Falls (AA) | 12 | Great Falls Crosstown Meet |
| 50.56 | Khye Gamas | Glasgow (B) | 10 | State B Championship |
| 50.60 | Beck Whicker | Custer Co./Miles City (A) | 11 | Eastern A Divisional |
| 50.64 | Blaine Downing | Saco (C) | 11 | State C Championship |
| 50.89 | Shae Warner | Glacier (AA) | 11 | State AA Championship |
| 50.97 | Emmanuel White | Helena Capital (AA) | 12 | State AA Championship |
| 51.02 | Brady Kolendich | Missoula Sentinel (AA) | 12 | State AA Championship |
| 51.08 | Cohen Kastelitz | Glacier (AA) | 12 | State AA Championship |
| 51.09 | Brock Grossman | Fort Benton (C) | 12 | State C Championship |
| 51.13 | Mason Dethman | Froid-Medicine Lake (C) | 12 | State C Championship |
| 51.15 | Ben Shaules | Missoula Sentinel (AA) | 11 | State AA Championship |
| 51.17 | Samuel Jagodzinski | Billings Central (A) | 11 | Eastern A Divisional |
| 51.19 | Romulus Hiner | Harlowton-Ryegate-Judith Gap (C) | 12 | Billings Invitational |
| 51.22 | Grady Caton | Missoula Hellgate (AA) | 11 | State AA Championship |
| 51.22 | Ryan Doyle | Turner (C) | 12 | Northern C Divisional |
| 51.24 | James Greene | Cut Bank (B) | 12 | State B Championship |
| 51.24 | William Snell | Billings Central (A) | 10 | Billings Invite |
| 51.25 | Dylan Hill | Helena (AA) | 10 | Helena Crosstown Meet |
| 51.26 | Zachary Stidham | Billings Skyview (AA) | 12 | Eastern AA Divisional |
| 51.36 | Travis Ryland-Davis | Helena (AA) | 11 | State AA Championship |
| 51.36 | Myles Allen | Fairfield (B) | 12 | State B Championship |
| 51.52 | Terran Joseph | Lustre Christian (C) | 12 | 3C Districts |
| 51.59 | Randon Richman | Shelby (B) | 12 | Cascade Top 8 Meet |
| 51.64 | Matthew Tobiason | Loyola Sacred Heart (B) | 11 | 6B Districts |
| 51.69 | Louis Kamps | Gallatin (Bozeman) (AA) | 10 | State AA Championship |
| 51.71 | Alec Dalby | Park/Livingston (A) | 12 | Eastern A Divisional |
| 51.74 | Cooper Nelson | Helena Capital (AA) | 11 | Helena Crosstown Meet |
| 51.75 | Adam Guajardo | Missoula Big Sky (AA) | 10 | Butte-Big Sky Dual |
| 51.76 | Gage Gunther | Custer Co./Miles City (A) | 12 | State A Championship |
| 51.77 | Bergen Mysse | Jefferson/Boulder (B) | 12 | Southern B Divisional |
| 51.78 | Shaphan Hubner | Manhattan Christian (C) | 11 | State C Championship |
| 51.78 | Caleb Stosich | Sweet Grass Co./Big Timber (B) | 11 | State B Championship |
| 51.79 | Miles Wells | Hardin (A) | 12 | Laurel Iron Horse Meet |
| 51.81 | Owen Reynolds | Red Lodge (B) | 12 | State B Championship |
| 51.81 | Ethan DeLeon | Billings Senior (AA) | 10 | Billings City Meet |
| 51.82 | Gabe Schons | Red Lodge (B) | 11 | State B Championship |
| 51.83 | Colby Minton | Valley Christian (C) | 9 | State C Championship |
| 51.88 | Benedikt Syrbe | Chester-Joplin-Inverness (C) | 11 | Manhattan Christian Invitational |
| 51.88 | Ethan Amick | Whitefish (A) | 11 | Whitefish ARM Invitational |
| 51.90 | River Wasson | Great Falls CMR (AA) | 12 | Eastern AA Divisional |
| 51.96 | Ryan Maus | Helena (AA) | 12 | Skor Dekam Invitational |
| 51.99 | Keith Applebee | Bozeman (AA) | 12 | Eastern AA Divisional |
| 51.99 | Kale Konecny | Billings Senior (AA) | 11 | Eastern AA Divisional |