| Mark | School | Meet |
|---|
| 42.67 | Billings Senior (AA) | State AA Track Meet |
| 42.77 | Bozeman (AA) | State AA Track Meet |
| 42.81 | Billings West (AA) | State AA Track Meet |
| 42.86 | Great Falls (AA) | State AA Track Meet |
| 43.51 | Billings Central (A) | State A Track Meet |
| 43.58 | Butte (AA) | State AA Track Meet |
| 43.65 | Helena (AA) | State AA Track Meet |
| 43.82 | Charlo (C) | State C Track Meet |
| 43.83 | Beaverhead Co./Dillon (A) | State A Track Meet |
| 43.84 | Columbia Falls (A) | State A Track Meet |
| 43.88 | Glacier (AA) | Western AA Divisional |
| 43.94 | Belgrade (AA) | Central A Divisional |
| 43.98 | Ronan (A) | State A Track Meet |
| 44.07 | Helena Capital (AA) | State AA Track Meet |
| 44.07 | Billings Skyview (AA) | Eastern AA Divisional |
| 44.17 | Glacier (AA) | State AA Track Meet |
| 44.18 | Park/Livingston (A) | State A Track Meet |
| 44.20 | Missoula Sentinel (AA) | Greg Rice City Meet |
| 44.23 | Flathead (AA) | Western AA Divisional |
| 44.24 | Great Falls CMR (AA) | Great Falls City Meet |
| 44.24 | Broadwater/Townsend (B) | State B Track Meet |
| 44.25 | Missoula Hellgate (AA) | Greg Rice City Meet |
| 44.34 | Bigfork (B) | State B Track Meet |
| 44.58 | Manhattan (B) | State B Track Meet |
| 44.71 | Chinook (C) | State C Track Meet |
| 44.88 | Libby (A) | Libby Invitational |
| 44.93 | Stevensville (A) | State A Track Meet |
| 44.99 | Thompson Falls (B) | State B Track Meet |
| 45.10 | Powell Co./Deer Lodge (B) | Western B Divisional |
| 45.11 | Custer Co./Miles City (A) | State A Track Meet |
| 45.12 | Wibaux (C) | State C Track Meet |
| 45.14 | Missoula Big Sky (AA) | Greg Rice City Meet |
| 45.15 | Loyola Sacred Heart (B) | Western B Divisional |
| 45.16 | Harlowton (C) | Park City/Harlowton Invitational |
| 45.16 | Choteau (B) | State B Track Meet |
| 45.21 | Malta (B) | Northeast Top 10 |
| 45.24 | Laurel (A) | Miles City Invitational |
| 45.34 | Polson (A) | Northwest A Divisional |
| 45.35 | Whitefish (A) | Western Montana Top 10 |
| 45.39 | Frenchtown (A) | Southwest A Divisional |
| 45.42 | Columbus (B) | Al Walker Memorial Invitational |
| 45.47 | Victor (C) | State C Track Meet |
| 45.47 | Darby (B) | District 6B |
| 45.47 | Dawson Co./Glendive (A) | State A Track Meet |
| 45.50 | Corvallis (A) | Wayne Estes Invitational |
| 45.50 | Hardin (A) | Midland Top 10 |