| Mark | Athlete | School | Year | Meet |
|---|
| 49.28 | John Daubert | Billings Senior (AA) | 12 | State AA Track Meet |
| 49.65 | Kyle Nickol | Helena Capital (AA) | 10 | Western AA Divisional |
| 49.68 | Pres Harris | Plentywood (B) | 12 | Miles City Invitational |
| 49.70 | Cash Ehlers | Sunburst (C) | 12 | State C Track Meet |
| 49.71 | Marc Swan | Manhattan (B) | 12 | Midland Roundtable Top 10 Meet |
| 49.83 | Zannon Stands | Hardin (A) | 12 | Miles City Invitational |
| 49.92 | Chris Allen | Belgrade (A) | 12 | Beaverhead Booster Meet |
| 50.04 | Dustin Sobrero | Columbus (B) | 11 | 4B Districts |
| 50.14 | Doug Raymer | Darby (C) | 12 | Western C Divisional |
| 50.14 | Isaac Howard | Choteau (B) | 12 | 1B Districts |
| 50.17 | Stephen Delaney | Charlo (C) | 12 | State C Track Meet |
| 50.29 | Alex Klatt | Billings Senior (AA) | 11 | State AA Track Meet |
| 50.43 | Jacob Senecal | Powell County/Deer Lodge (B) | 12 | Western B Divisional |
| 50.44 | Michael Managhan | Flathead (AA) | 12 | State AA Track Meet |
| 50.60 | Cale Howells | Manhattan (B) | 12 | Southern B Divisional |
| 50.69 | Dylan Reynolds | Florence-Carlton (B) | 12 | 6B Districts |
| 50.70 | Beau Maus | Corvallis (A) | 12 | State A Track Meet |
| 50.72 | Tyler Roush | Billings West (AA) | 10 | Billings West Invitational |
| 50.78 | Ryan Hayes | Bigfork (B) | 12 | Western Montana Top 10 |
| 50.84 | Alex Wambach | Billings West (AA) | 12 | Billings West Invitational |
| 50.87 | Thomas Neale | Billings Skyview (AA) | 12 | State AA Track Meet |
| 50.89 | Jacob Kvilhaug | Billings West (AA) | 11 | State AA Track Meet |
| 50.92 | Logan Harwood | Whitefish (A) | 11 | Class A Invitational |
| 51.07 | Anthony Correa | Columbia Falls (A) | 12 | Northwestern A Divisional |
| 51.09 | Trey Cates | Great Falls CMR (AA) | 12 | Eastern AA Divisional |
| 51.10 | Brady Blomquist | Florence-Carlton (B) | 12 | 4-21 Seeley-Swan Invitational |
| 51.13 | Logan Laird | Billings West (AA) | 10 | Swede Dahlberg Memorial |
| 51.26 | Jon Nissen | Laurel (A) | 11 | Eastern A Divisional |
| 51.48 | Colter Porter | Billings West (AA) | 11 | Eastern AA Divisional |
| 51.52 | Kyle Koszuta | Billings Skyview (AA) | 11 | Eastern AA Divisional |
| 51.53 | Nick Propp | Missoula Sentinel (AA) | 12 | Swede Dahlberg Memorial |
| 51.53 | Taylor Clark | Billings West (AA) | 11 | Eastern AA Divisional |
| 51.54 | Dylan Surber | Chinook (C) | 11 | 4-21 Cut Bank Invitational |
| 51.57 | Colby Henderson | Corvallis (A) | 12 | Polson ABC Meet |
| 51.62 | Alex Mustard | Missoula Big Sky (AA) | 10 | Greg Rice City Meet |
| 51.64 | Zach Perrin | Flathead (AA) | 11 | Whitefish A.R.M. Invitational |
| 51.64 | Isaiah Collins | Great Falls CMR (AA) | 12 | CMR-Helena Dual |
| 51.67 | Brock Butcher | Fergus/Lewistown (A) | 9 | Midland Roundtable Top 10 Meet |
| 51.68 | Jesse Pfertsh | Twin Bridges (C) | 11 | Western Montana Top 10 |
| 51.74 | Andy Nordstrom | Red Lodge (B) | 10 | 4B Districts |
| 51.87 | Kole Garitone | Billings West (AA) | 11 | Eastern AA Divisional |
| 51.91 | Kodee Varner | Baker (B) | 12 | 3B Districts |
| 51.94 | Beau Milton | Joliet (B) | 12 | Southern B Divisional |
| 51.97 | Luke Cardon | Whitefish (A) | 9 | Northwestern A Divisional |
| 51.98 | Derrick Williams | Columbia Falls (A) | 12 | Northwestern A Divisional |
| 52.55 | Darius Pool | Drummond (C) | 12 | 13C Districts |