| Mark | Athlete | School | Year | Meet |
|---|
| 49.25 | John Daubert | Billings Senior (AA) | 11 | State AA Track Meet |
| 49.50 | Kevin Close | Bozeman (AA) | | State AA Track Meet |
| 49.92 | Pres Harris | Plentywood (B) | 11 | State B Track Meet |
| 49.97 | Aaron Johnston | Darby (B) | | State B Track Meet |
| 50.07 | Mike Duncan | Missoula Big Sky (AA) | | State AA Track Meet |
| 50.10 | Anthony Correa | Columbia Falls (A) | 12 | State A Track Meet |
| 50.12 | Charles Old Chief | Browning (A) | 12 | State A Track Meet |
| 50.13 | Andrew Monaco | Billings Senior (AA) | | Butte Quad |
| 50.44 | Marc Swan | Manhattan (B) | 11 | State B Track Meet |
| 50.55 | Logan Harwood | Whitefish (A) | 10 | State A Track Meet |
| 50.71 | Jacob Senecal | Powell Co./Deer Lodge (B) | 11 | State B Track Meet |
| 50.92 | Adam DeBruycker | Choteau (B) | | Seeley-Swan Invitational 5/7 |
| 50.99 | Josh Conner | Billings Skyview (AA) | 12 | Swede Dahlberg Invitational |
| 51.00 | Trent Streeter | Harlowton (C) | | Midland Top 10 |
| 51.02 | Dakotah Kingfisher | Great Falls (AA) | | State AA Track Meet |
| 51.05 | Colby Henderson | Corvallis (A) | 11 | State A Track Meet |
| 51.06 | Logan Dahinden | Belgrade (AA) | | State C Track Meet |
| 51.11 | Riley Shaw | Fort Benton (C) | | State C Track Meet |
| 51.11 | Nathan Vanderby | Manhattan (B) | | State B Track Meet |
| 51.19 | Chris Allen | Belgrade (AA) | 11 | State A Track Meet |
| 51.22 | Alex Klatt | Billings Senior (AA) | 10 | State AA Track Meet |
| 51.25 | Jacob Leininger | Glacier (AA) | | Western AA Divisional |
| 51.32 | Jacob Senecal | Powell Co./Deer Lodge (B) | 11 | Western B Divisional |
| 51.34 | Thomas Neale | Billings Skyview (AA) | 12 | State AA Track Meet |
| 51.43 | Killian Smith | Helena Capital (AA) | | State AA Track Meet |
| 51.50 | Derrick Williams | Columbia Falls (A) | 11 | Glacier-Columbia Falls Dual |
| 51.51 | Michael Managhan | Flathead (AA) | 12 | State AA Track Meet |
| 51.51 | Stephen Delaney | Charlo (C) | 11 | State C Track Meet |
| 51.54 | Zannon Stands | Hardin (A) | 11 | State A Track Meet |
| 51.59 | Brady Blomquist | Florence-Carlton (B) | 12 | District 6B |
| 51.75 | Sage McCleary | Bozeman (AA) | 12 | Eastern AA Divisional |
| 51.87 | Cash Ehlers | Sunburst (C) | 12 | State C Track Meet |