| Mark | Athlete | School | Year | Meet |
|---|
| 4:18.80 | Taylor Wanner | Lockwood (A) | 12 | Sidney Twilight Meet |
| 4:19.89 | Simon Douglas | Whitefish (A) | 12 | Nelson-Thomas ABC Meet |
| 4:20.32 | Jonah Njos | Lockwood (A) | 11 | Sidney Twilight Meet |
| 4:20.76 | Finn Schretenthaler | Park/Livingston (A) | 11 | Eastern A Divisional |
| 4:21.49 | Ben Bird | Hardin (A) | 10 | Sidney Twilight Meet |
| 4:24.68 | Grey Piseno | Billings Central (A) | 11 | Midland Roundtable Top 10 |
| 4:25.04 | David DiGiallonardo | Polson (A) | 11 | Nelson-Thomas ABC Meet |
| 4:25.64 | Jack Davidson | Corvallis (A) | 12 | Western A Divisional |
| 4:28.58 | Jaden Silha | Dawson Co./Glendive (A) | 12 | Eastern A Divisional |
| 4:29.08 | Samuel Jagodzinski | Billings Central (A) | 12 | Glendive Shriners Invitational |
| 4:29.66 | Taylor Doleac | Hamilton (A) | 11 | Western A Divisional |
| 4:30.42 | River Racine | Browning (A) | 11 | Western A Divisional |
| 4:32.61 | Noah Njos | Dawson Co./Glendive (A) | 12 | Sidney Twilight Meet |
| 4:35.25 | Jacob Piapot | Ronan (A) | 12 | Nelson-Thomas ABC Meet |
| 4:35.71 | Kayden Stewart | Hardin (A) | 11 | Sidney Twilight Meet |
| 4:35.72 | Bryson Poulsen | Hamilton (A) | 12 | Nelson-Thomas ABC Meet |
| 4:35.78 | Warner Bowman | Hardin (A) | 10 | Sidney Twilight Meet |
| 4:35.89 | Cody Watson | Libby (A) | 10 | Western A Divisional |
| 4:36.29 | Carter Koerner | Corvallis (A) | 11 | Nelson-Thomas ABC Meet |
| 4:36.73 | Taggart Jessop | Corvallis (A) | 11 | Western A Divisional |
| 4:38.18 | Noah Hamilton-Dixon | Bigfork (A) | 11 | Western A Divisional |
| 4:38.69 | Cody Watson | Libby (A) | 10 | Whitefish ARM Invitational |
| 4:39.31 | Braden Anderson | Corvallis (A) | 9 | Western A Divisional |
| 4:40.00 | River Blazejewski | Columbia Falls (A) | 11 | Western A Divisional |