| Mark | Athlete | School | Year | Meet |
|---|
| 48.10 | William Hollensteiner | Flathead (AA) | 11 | Archie Roe Invitational |
| 48.66 | William Snell | Billings Central (A) | 11 | Midland Roundtable Top 10 |
| 49.18 | Lane Chivers | Flathead (AA) | 12 | Western AA Divisional |
| 49.20 | Evan Bennett | Hamilton (A) | 12 | Western A Divisional |
| 49.27 | Beck Whicker | Custer Co./Miles City (A) | 12 | Midland Roundtable Top 10 |
| 49.44 | Wilson Schmidt | Belgrade (AA) | 11 | Skyview/Bozeman/Belgrade Tri |
| 49.59 | Jack Phelps | Columbia Falls (A) | 12 | Western A Divisional |
| 49.71 | Ethan DeLeon | Billings Senior (AA) | 11 | Eastern AA Divisional |
| 49.87 | Brayden McCoy | Valley Christian (C) | 12 | State B/C Championship |
| 49.94 | Adam Guajardo | Missoula Big Sky (AA) | 11 | Western AA Divisional |
| 49.96 | Reid Bartholomew | Gallatin (Bozeman) (AA) | 11 | Eastern AA Divisional |
| 50.00 | Kougar Kappel | Red Lodge (B) | 11 | Midland Roundtable Top 10 |
| 50.05 | Trizten Avila | Superior (B) | 12 | State B/C Championship |
| 50.09 | Luke Ruch | Helena (AA) | 12 | Skor Dekam Invite |
| 50.11 | Michael Hughes | Billings Skyview (AA) | 12 | Eastern AA Divisional |
| 50.16 | Colby Minton | Whitefish (A) | 10 | Western A Divisional |
| 50.18 | Cooper Nelson | Helena Capital (AA) | 11 | Skor Dekam Invite |
| 50.19 | Ledger Martin | Conrad (B) | 10 | State B/C Championship |
| 50.19 | Joshua Eckhart | Hardin (A) | 12 | Eastern A Divisional |
| 50.27 | Caleb Conver | Billings West (AA) | 12 | Senior/Gallatin/West Triangular |
| 50.31 | Christian Triemstra | Manhattan Christian (C) | 12 | State B/C Championship |
| 50.31 | Ben Bliven | Flathead (AA) | 12 | Western AA Divisional |
| 50.37 | Khye Gamas | Glasgow (B) | 11 | State B/C Championship |
| 50.43 | Chandler Christensen | Billings Skyview (AA) | 12 | Eastern AA Divisional |
| 50.48 | Preston McPherson | Whitefish (A) | 12 | Western A Divisional |
| 50.50 | Tucker Keller | Melstone (C) | 11 | Midland Roundtable Top 10 |
| 50.56 | Dylan Hill | Helena (AA) | 11 | Helena Crosstown Meet |
| 50.70 | Matthew Tobiason | Loyola Sacred Heart (B) | 12 | State B/C Championship |
| 50.71 | Travis Ryland-Davis | Helena (AA) | 12 | Western AA Divisional |
| 50.71 | Caleb Stosich | Sweet Grass Co./Big Timber (B) | 12 | Southern B/C Divisional |
| 50.74 | Tayen Edmo | Ronan (A) | 12 | Western A Divisional |
| 50.77 | Trent Karst | Fairview (B) | 12 | State B/C Championship |
| 50.81 | Blake Williams | Missoula Big Sky (AA) | 11 | Missoula "Greg Rice" City Meet |
| 50.81 | Lucas Kadillak | Bozeman (AA) | 12 | Last Chance Qualifier |
| 50.90 | Dawson Hammond | Malta (B) | 11 | State B/C Championship |
| 50.97 | Louis Kamps | Gallatin (Bozeman) (AA) | 11 | Bozeman Crosstown Dual |
| 51.02 | Grady Caton | Missoula Hellgate (AA) | 12 | Hellgate/Sentinel/Flathead Tri |
| 51.05 | Isaac Bates | Florence-Carlton (B) | 12 | Western B/C Divisional |
| 51.05 | Thatcher Schmidt | Belgrade (AA) | 11 | Eastern AA Divisional |
| 51.15 | Colter Anderson | Sweet Grass Co./Big Timber (B) | 11 | Southern B/C Divisional |
| 51.15 | Josh Lambertsen | Lincoln Co./Eureka (B) | 11 | 7B District Meet |
| 51.16 | Gage Wardell | Billings Skyview (AA) | 11 | Eastern AA Divisional |
| 51.16 | Gavin Miller | Darby (B) | 9 | Western B/C Divisional |
| 51.17 | Auston Schellig | Joliet (B) | 11 | 4B District Meet |
| 51.18 | Ethan Young | Great Falls CMR (AA) | 11 | Eastern AA Divisional |
| 51.20 | McKay Shobe | Fergus/Lewistown (A) | 11 | Eastern A Divisional |
| 51.21 | Christian Landers | Bozeman (AA) | 11 | Eastern AA Divisional |
| 51.23 | Shaphan Hubner | Manhattan Christian (C) | 12 | State B/C Championship |
| 51.24 | Teigan Blomquist | Billings West (AA) | 11 | Eastern AA Divisional |
| 51.27 | Samuel Jagodzinski | Billings Central (A) | 12 | MC John Polich Invite |
| 51.28 | Kellen Gibson | Missoula Sentinel (AA) | 11 | Western AA Divisional |
| 51.30 | Kasen Kastner | Flathead (AA) | 12 | Hellgate/Sentinel/Flathead Tri |
| 51.32 | McCoy Townsend | Darby (B) | 11 | Western B/C Divisional |
| 51.41 | Jake McCarthy | Hamilton (A) | 11 | Western A Divisional |
| 51.43 | Boone Davis | Helena Capital (AA) | 10 | Capital vs CMR Dual |
| 51.48 | Ethan Anderson | Glacier (AA) | 12 | Glacier/Sentinel Dual |
| 51.54 | Isaiah Gather | Three Forks (B) | 11 | Midland Roundtable Top 10 |
| 51.54 | Simon Douglas | Whitefish (A) | 12 | Last Chance Quad |
| 51.55 | Seth Dunster | Seeley-Swan (C) | 12 | State B/C Championship |
| 51.56 | Shae Warner | Glacier (AA) | 12 | Columbia Falls/Glacier Dual |
| 51.59 | Austin Savik | Bigfork (A) | 11 | Western A Divisional |
| 51.59 | Drew Almquist | Helena Capital (AA) | 10 | East Helena Quad Meet |
| 51.62 | Ryland Humphrey | Billings West (AA) | 11 | Senior/Gallatin/West Triangular |
| 51.63 | Wade Qualtier | Ronan (A) | 12 | Nelson-Thomas ABC Meet |
| 51.64 | Solomon Morgan | Corvallis (A) | 12 | Ravalli County Invitational |
| 51.65 | Axel Kowalski | Helena (AA) | 9 | Western AA Divisional |
| 51.66 | Brandon Williams | Joliet (B) | 11 | Al Walker Memorial Meet |
| 51.71 | Ethan Amick | Whitefish (A) | 12 | Western A Divisional |
| 51.76 | Owen Thiel | Glacier (AA) | 11 | Columbia Falls/Glacier Dual |
| 51.79 | Cole Kramer | Ennis (B) | 12 | Al Walker Memorial Meet |
| 51.85 | Santiago Soto | Billings Skyview (AA) | 9 | Eastern AA Divisional |
| 51.86 | Jadon Persinger | Columbia Falls (A) | 12 | Western A Divisional |
| 51.89 | Blaine Downing | Saco (C) | 12 | Red Lodge Classic |
| 51.92 | Calvin Paczkowski | Billings West (AA) | 11 | Senior/Gallatin/West Triangular |
| 51.92 | Dylan Almquist | Helena Capital (AA) | 12 | Skor Dekam Invite |
| 51.93 | Tyler Lane | Cascade (C) | 12 | Choteau Twilight Meet |
| 51.93 | Cormack Batt | Missoula Big Sky (AA) | 11 | Big Sky Quad |
| 51.93 | Treyton Tinsen | Highwood (C) | 11 | State B/C Championship |
| 51.95 | Simon Lillard | Glacier (AA) | 12 | CMR/Glacier Dual |
| 51.95 | Jake Schlothauer | Fairview (B) | 9 | State B/C Championship |
| 52.00 | Jace Vogel | Billings West (AA) | 9 | Eastern AA Divisional |