| Mark | School | Meet |
|---|
| 43.58 | Columbus (B) | Southern B/C Divisional |
| 43.90 | Joliet (B) | Midland Roundtable Top 10 |
| 44.01 | Fairview (B) | Northern B Divisional |
| 44.08 | Loyola Sacred Heart (B) | Frenchtown/Loyola |
| 44.15 | Florence-Carlton (B) | Western B/C Divisional |
| 44.32 | Jefferson/Boulder (B) | 5B/12C District Meet |
| 44.39 | Malta (B) | Northern B Divisional |
| 44.41 | Manhattan (B) | Southern B/C Divisional |
| 44.74 | Red Lodge (B) | Gold Strike Invitational |
| 44.82 | Baker (B) | 3B/4C District Meet |
| 45.10 | Glasgow (B) | Norm Girard Top 10 Track Meet |
| 45.11 | Three Forks (B) | Harlo/Park City Meet |
| 45.19 | Sweet Grass Co./Big Timber (B) | Southern B/C Divisional |
| 45.24 | Plains (B) | Archie Roe Invitational |
| 45.43 | Conrad (B) | Northern B Divisional |