| Mark | School | Meet |
|---|
| 43.46 | Corvallis (A) | Sapphire Twilight Meet |
| 43.61 | Frenchtown (A) | Russ Plicher Western Top 10 |
| 43.75 | Custer Co./Miles City (A) | Eastern A Divisional |
| 43.86 | Laurel (A) | Railyard Trials |
| 43.93 | Hamilton (A) | Western A Divisional |
| 43.98 | Bigfork (A) | Nelson-Thomas ABC Meet |
| 43.98 | Whitefish (A) | Whitefish ARM Invitational |
| 43.99 | Columbia Falls (A) | Sapphire Twilight Meet |
| 44.54 | Fergus/Lewistown (A) | Midland Roundtable Top 10 |
| 44.79 | Billings Central (A) | Eastern A Divisional |
| 44.87 | Havre (A) | Eastern A Divisional |
| 45.03 | Sidney (A) | Eastern A Divisional |
| 45.03 | Butte Central (A) | Joe Tacke Invitational |