| M | NHIAA Division III Championships | 49.60 | Ben Thurston | Gilford | 1992 |
| S | NHIAA State Records | 48.24 | Noah Woodman | Pinkerton | 2017 |
| Lane | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|
| 1 | OKINEDO, Ariel | SR | Bishop Brady | 56.00 |
| 2 | STEIGMEYER, Nate | JR | Bishop Brady | 55.65 |
| 3 | LACLAIR, Kayden | JR | Stevens | 55.54 |
| 4 | KAMANN, Tristan | SO | Inter-Lakes | 55.42 |
| 5 | HARPER, Joe | JR | Raymond | 55.46 |
| 6 | DILULLO, Nik | SR | Pittsfield | 55.59 |
| 7 | SENESOMBATH, Jameson | JR | Newmarket | 55.79 |
| 8 | NAPOLETANO, Tyler | JR | Newmarket | 56.17 |
| Lane | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|
| 1 | HODGE, Zach | SR | Kearsarge | 53.68 |
| 2 | REESE, Isaiah | SO | Gilford | 52.80 |
| 3 | CHAUDHRY, DJ | JR | Campbell | 51.49 |
| 4 | CARNEY, Owen | SR | Inter-Lakes | 50.34 |
| 5 | DAVIS, JJ | SR | Kearsarge | 50.34 |
| 6 | MOUSSEAU, Sullivan | SR | Laconia | 52.49 |
| 7 | GOODWIN, Patrick | SR | Winnisquam | 53.44 |
| 8 | CIGLAR, Jon | SO | Conant | 55.36 |