| Mark | Athlete | School | Year | Meet |
|---|
| 49.28 | Nash Coley | Gallatin (Bozeman) (AA) | 11 | Eastern AA Divisional |
| 49.34 | Kohbe Smith | Dawson Co./Glendive (A) | 11 | State A Championship |
| 49.55 | Jeff Lillard | Glacier (AA) | 12 | Western AA Divisional |
| 49.57 | Jackson Tarver | Great Falls CMR (AA) | 11 | Eastern AA Divisional |
| 49.62 | Treyton Graham | Beaverhead Co./Dillon (A) | 12 | Western A Divisional |
| 49.92 | Wilson Schmidt | Belgrade (AA) | 9 | Eastern AA Divisional |
| 50.13 | Garrett Dahlke | Gallatin (Bozeman) (AA) | 12 | Skor DeKam Invite |
| 50.15 | Anthony Ramirez | Billings West (AA) | 10 | Eastern AA Divisional |
| 50.19 | William Wagner | Florence-Carlton (B) | 12 | State B Championship |
| 50.20 | Gavin Garrison | Beaverhead Co./Dillon (A) | 12 | State A Championship |
| 50.26 | Luca Dombrowski | Loyola Sacred Heart (B) | 12 | Russ Plicher Top 10 |
| 50.34 | Brady Kolendich | Missoula Sentinel (AA) | 11 | Western AA Divisional |
| 50.39 | Henry Ballinger | Helena (AA) | 12 | State AA Championship |
| 50.39 | Derek Criddle | Corvallis (A) | 11 | Western A Divisional |
| 50.50 | Peyton Nelson | Helena Capital (AA) | 11 | Helena Crosstown Meet |
| 50.60 | Eli Taylor | Hamilton (A) | 12 | Western A Divisional |
| 50.74 | Kade Boyd | Billings Central (A) | 12 | Eastern A Divisional |
| 50.78 | Gideon Boswell | Corvallis (A) | 10 | State A Championship |
| 50.79 | Osker Patterson | Gallatin (Bozeman) (AA) | 11 | Skor DeKam Invite |
| 50.88 | Malaki Simpson | Columbia Falls (A) | 11 | Whitefish ARM Invitational |
| 50.97 | Ryan Harrington | Great Falls (AA) | 11 | Great Falls Crosstown Dual |
| 51.00 | Carter White | Frenchtown (A) | 12 | Western A Divisional |
| 51.01 | Keagen Crosby | Missoula Sentinel (AA) | 12 | Glacier-Sentinel Dual |
| 51.08 | Clay Oven | Billings Central (A) | 12 | Eastern A Divisional |
| 51.14 | Aaron French | Helena (AA) | 11 | Skor DeKam Invite |
| 51.16 | William Hollensteiner | Flathead (AA) | 9 | State AA Championship |
| 51.16 | Cole Kramer | Ennis (B) | 10 | State C Championship |
| 51.17 | Merek Mihelish | Helena Capital (AA) | 10 | Helena Small Schools Meet |
| 51.19 | Aiden Marceau | Missoula Big Sky (AA) | 11 | State AA Championship |
| 51.19 | Titus Sykes | Bozeman (AA) | 11 | State AA Championship |
| 51.20 | Luke Ruch | Helena (AA) | 10 | Western AA Divisional |
| 51.23 | Ben Shaules | Missoula Sentinel (AA) | 10 | Western AA Divisional |
| 51.25 | Randon Richman | Shelby (B) | 11 | State B Championship |
| 51.33 | Seth Amunrud | Manhattan Christian (C) | 12 | State C Championship |
| 51.39 | Emmanuel White | Helena Capital (AA) | 11 | State AA Championship |
| 51.44 | Shaphan Hubner | Manhattan Christian (C) | 10 | Red Lodge Invite |
| 51.48 | Tevin Wetzel | Helena (AA) | 10 | Skor DeKam Invite |
| 51.51 | Ian Harrison | Missoula Sentinel (AA) | 12 | Western AA Divisional |
| 51.57 | Issac Kohler | Butte (AA) | 12 | Bozeman Triangular |
| 51.59 | Kaeden Sager | East Helena (A) | 12 | John Tomich Invitational |
| 51.63 | Drifter Skillicorn | Polson (A) | 12 | Nelson-Thomas ABC Meet |
| 51.67 | Ethan Anderson | Glacier (AA) | 10 | Columbia Falls-Glacier Dual |
| 51.68 | JD Shepard | Belt (C) | 11 | State C Championship |
| 51.73 | Riley Cline | Custer Co./Miles City (A) | 12 | Sidney Invitational |
| 51.75 | Bryce Williams | Joliet (B) | 12 | Red Lodge Invite |
| 51.77 | Jasiah Hambira | Lustre Christian (C) | 12 | Norm Girard North/East Top 10 |
| 51.85 | Travis Ryland-Davis | Helena (AA) | 10 | Western AA Divisional |
| 51.87 | Reid Malcolm | Park/Livingston (A) | 12 | State A Championship |
| 51.88 | Nathan Adams | Manhattan Christian (C) | 12 | Manhattan Christian Invitational |
| 51.90 | Max Cianflone | Hamilton (A) | 12 | State A Championship |
| 51.93 | Avery Crouse | Fergus/Lewistown (A) | 12 | Eastern A Divisional |
| 51.93 | Colby Worthington | Billings West (AA) | 12 | Eastern AA Divisional |
| 51.94 | Cohen Kastelitz | Glacier (AA) | 11 | Western AA Divisional |
| 51.97 | Shae Warner | Glacier (AA) | 10 | Western AA Divisional |
| 51.99 | Zachary Stidham | Billings Skyview (AA) | 11 | Eastern AA Divisional |
| 52.21 | Juliun Benson | Wolf Point (B) | 12 | Northern B Divisional |