| M | NHIAA Division III Championships | 57.14 | Carolyn Maynard | Hopkinton | 2010 |
| S | NHIAA State Records | 55.42 | Grace Devanny | Concord | 2019 |
| Athlete | Yr. | Team | Seed | |
|---|---|---|---|---|
| 1 | CHIRICHELLA, Liliana | SR | Monadnock | 1:00.34 |
| 2 | HAGEN, Alanna | SO | Newmarket | 1:02.01 |
| 3 | BOVE, Reese | FR | Hopkinton | 1:02.59 |
| 4 | BOVELL, Isabella | FR | Stevens | 1:03.79 |
| 5 | FERMON, Holly | JR | Newmarket | 1:04.40 |
| 6 | MURPHY, Brynn | SR | Stevens | 1:04.44 |
| 7 | KHAM, Dasia | SR | Campbell | 1:04.96 |
| 8 | ROBINSON, Valerie | FR | Inter-Lakes | 1:05.52 |
| 9 | GREENWOOD, Haley | SO | Laconia | 1:06.10 |
| 10 | MALLOY, Ayden | JR | Laconia | 1:06.14 |
| 11 | SULLIVAN, Brooke | SR | Campbell | 1:07.02 |
| 12 | HOLDERMAN, Rachel | SO | Kearsarge | 1:07.38 |
| 13 | O'NEIL, Delaney | SO | Raymond | 1:07.47 |
| 14 | LEBLANC, Nevaeh | FR | Stevens | 1:07.73 |
| 15 | DUBE, Katryna | SO | White Mountains | 1:09.06 |
| 16 | EDGREN, Alyssa | JR | Belmont | 1:10.44 |