| Mark | School | Meet |
|---|
| 42.52 | Billings Senior (AA) | State AA Track Meet |
| 42.98 | Billings West (AA) | State AA Track Meet |
| 43.05 | Missoula Sentinel (AA) | State AA Track Meet |
| 43.08 | Helena Capital (AA) | State AA Track Meet |
| 43.19 | Butte (AA) | Swede Dahlberg Memorial |
| 43.20 | Great Falls CMR (AA) | Great Falls Crosstown Meet |
| 43.26 | Stevensville (A) | State A Track Meet |
| 43.30 | Billings Central (A) | State A Track Meet |
| 43.75 | Helena (AA) | Swede Dahlberg Memorial |
| 43.77 | Flathead (AA) | State AA Track Meet |
| 43.84 | Billings Skyview (AA) | State AA Track Meet |
| 43.97 | Missoula Big Sky (AA) | Western AA Divisional |
| 43.98 | Custer Co./Miles City (A) | Eastern A Divisional |
| 44.07 | Corvallis (A) | State A Track Meet |
| 44.27 | Great Falls (AA) | State AA Track Meet |
| 44.28 | Malta (B) | Northern B Divisional |
| 44.40 | Columbia Falls (A) | Northwestern A Divisional |
| 44.53 | Glacier (AA) | Class A Invitational |
| 44.60 | Frenchtown (A) | Missoula Quad |
| 44.68 | Charlo (C) | 5-5 Seeley-Swan Invitational |
| 44.71 | Loyola Sacred Heart (B) | Missoula Quad |
| 44.76 | Laurel (A) | 4-10 Billings Senior Meet |
| 44.77 | Savage (C) | State C Track Meet |
| 44.80 | Fairfield (B) | Northern B Divisional |
| 44.84 | Bozeman (AA) | Valley Meet |
| 44.84 | Beaverhead Co./Dillon (A) | State A Track Meet |
| 44.88 | Belgrade (AA) | State A Track Meet |
| 44.93 | Libby (A) | Northwestern A Divisional |
| 44.94 | Choteau (B) | 1B Districts |
| 44.94 | Thompson Falls (B) | Western B Divisional |
| 45.03 | Glacier (AA) | CMR-Glacier Dual |
| 45.03 | Hardin (A) | Midland Roundtable Top 10 Meet |
| 45.04 | Bigfork (A) | 7B Districts |
| 45.08 | Powell Co./Deer Lodge (B) | 6B Districts |
| 45.09 | Plentywood (B) | Northern B Divisional |
| 45.10 | Hamilton (A) | State A Track Meet |
| 45.11 | Florence-Carlton (B) | Western B Divisional |
| 45.11 | Ronan (B) | 6B Districts |
| 45.21 | Cut Bank (B) | Northern B Divisional |
| 45.30 | Baker (B) | Southern B Divisional |
| 45.36 | Red Lodge (B) | 4B Districts |
| 45.39 | Park City (B) | State C Track Meet |
| 45.45 | Forsyth (C) | Southern B Divisional |
| 45.47 | Dawson Co./Glendive (A) | Jock Stop Meet |
| 45.49 | Twin Bridges (C) | State C Track Meet |
| 45.49 | Polson (A) | Polson ABC Meet |
| 45.52 | Darby (B) | State C Track Meet |
| 45.55 | Chinook (B) | State C Track Meet |