| Mark | Athlete | School | Year | Meet |
|---|
| 49.16 | Connor Matthews | Helena (AA) | 11 | State AA |
| 49.29 | Jadin Casey | Stevensville (A) | 12 | Southwestern A Divisional |
| 49.38 | Isaac Desjarlais | Arlee (C) | 11 | Lake County Meet |
| 49.46 | Caleb Neth | Manhattan (B) | 11 | State B |
| 49.48 | Brock Butcher | Fergus/Lewistown (A) | 12 | Midland Roundtable Top 10 |
| 49.49 | Sean Opland | Troy (B) | 11 | State B |
| 49.54 | Dalton Daum | Butte (AA) | 12 | State AA |
| 49.88 | Taylor Sylvester | Corvallis (A) | 12 | State A |
| 49.94 | Jeremiah Coon | Helena (AA) | 12 | State AA |
| 50.04 | Koltin Haugrose | Belt (C) | 11 | State C |
| 50.11 | Levi Donaldson | Helena Capital (AA) | 12 | Western AA Divisional |
| 50.31 | Kelly Murnion | Garfield Co./Jordan (C) | 11 | State C |
| 50.36 | Bill Yeager | Twin Bridges (C) | 11 | Western C Divisional |
| 50.36 | Michael Gulledge | Billings Central (A) | 12 | State A |
| 50.37 | Brendan Atchison | Billings Skyview (AA) | 11 | Midland Roundtable Top 10 |
| 50.41 | Josh Barrows | Helena (AA) | 12 | Big Sky-Helena Dual |
| 50.44 | Cain Boschee | Glacier (AA) | 12 | Western AA Divisional |
| 50.50 | Dawson LaRance | Billings Senior (AA) | 10 | State AA |
| 50.54 | Riley Connell | Glacier (AA) | 12 | State AA |
| 50.60 | Karill Apedaile | Hamilton (A) | 12 | John Tomich Invitational |
| 50.68 | Rahkei Eyer | Jefferson/Boulder (B) | 11 | Kim Haines Invitational |
| 50.78 | Camren Kovarik | Missoula Sentinel (AA) | 10 | Western AA Divisional |
| 50.84 | Ben Hulme | Fort Benton (C) | 12 | State C |
| 50.86 | Danny Burton | Helena Capital (AA) | 11 | Western AA Divisional |
| 50.87 | Turner Stone | Manhattan (B) | 11 | State B |
| 50.90 | Dakota Pew | Dawson Co./Glendive (A) | 12 | Jock Stop Invitational |
| 50.93 | Simon Petsch | Billings West (AA) | 10 | Eastern AA Divisional |
| 50.94 | Conner Cross | Manhattan (B) | 11 | 5B Districts |
| 50.97 | Brian Fauntleroy | Whitefish (A) | 11 | Northwestern A Divisional |
| 51.01 | Chase Fossum | Glasgow (B) | 12 | State B |
| 51.18 | Jonathan Eastwood | Belgrade (AA) | 12 | Laurel Quad |
| 51.18 | Nate Rismon | Havre (A) | 11 | Whitefish ARM Invitational |
| 51.26 | Daniel Pendergast | Stevensville (A) | 12 | Southwestern A Divisional |
| 51.27 | David Estrada | Billings Senior (AA) | 10 | State AA |
| 51.34 | Tanner Dana | Columbia Falls (A) | 11 | Glacier-Columbia Falls Dual |
| 51.40 | Timmy Dutton | Billings Senior (AA) | 12 | Eastern AA Divisional |
| 51.43 | Anthony Byrns | Hot Springs (C) | 12 | Western C Divisional |
| 51.47 | Robert Jones | Frenchtown (A) | 12 | Northwestern A Divisional |
| 51.54 | Jacob Bahnmiller | Great Falls CMR (AA) | 12 | State AA |
| 51.66 | Luke Cardon | Whitefish (A) | 12 | Northwestern A Divisional |
| 51.67 | Josh Moore | Corvallis (A) | 12 | State A |
| 51.75 | Brandon Kubitz | Laurel (A) | 12 | Jock Stop Invitational |
| 51.79 | James Linabary | Bozeman (AA) | 12 | Eastern AA Divisional |
| 51.81 | Matt Farrier | Bigfork (B) | 10 | Western B Divisional |
| 51.84 | Tristen Guillot | Twin Bridges (C) | 12 | 11/12C Districts |
| 51.86 | Zander Mozier | Helena (AA) | 10 | Swede Dahlberg Invitational |
| 51.86 | Jed Nagler | Whitefish (A) | 11 | Columbia Falls-Whitefish Dual |
| 51.94 | Kenny Wilbur | Broadwater/Townsend (B) | 12 | 5B Districts |
| 51.95 | Jon Lebsock | Fairview (C) | 11 | Eastern Top 10 Meet |
| 51.99 | Carl Evans | Bozeman (AA) | 11 | Eastern AA Divisional |