| Mark | Athlete | School | Year | Meet |
|---|
| 2:16.77 | Makena Morley | Bigfork (B) | 9 | 4-21 Seeley-Swan Invitational |
| 2:21.07 | Chiara Warner | Broadwater/Townsend (B) | 11 | Southern B Divisional |
| 2:23.11 | Selene Johnson | Sweet Grass Co./Big Timber (B) | 12 | State B Track Meet |
| 2:24.21 | Maggie Mitzel | Loyola Sacred Heart (B) | 10 | State B Track Meet |
| 2:24.23 | Rachael Zeiger | Glasgow (B) | | State B Track Meet |
| 2:25.93 | Shay Shelhamer | Shepherd (B) | 10 | Midland Roundtable Top 10 Meet |
| 2:27.81 | Carly Recht | Sweet Grass Co./Big Timber (B) | | State B Track Meet |
| 2:28.01 | Felecia Earhart | Plains (B) | 10 | Western B Divisional |