| Time | Date | Name | Meet |
|---|---|---|---|
| 54.93 | Feb. 17, 2024 | Riley Bruns | Heartland Collegiate Athletic Conference Championships |
| 55.64 | Jan. 12, 2024 | Riley Bruns | ONU VS. WOOSTER VS. BLUFFTON |
| 55.70 | Nov. 4, 2023 | Riley Bruns | FRANKLIN VS BLUFFTON VS MANCHESTER 11-4-23 |
| 55.90 | Feb. 11, 2023 | Riley Bruns | Heartland Collegiate Athletic Conference Championships |
| 55.95 | Nov. 11, 2022 | Riley Bruns | Wittenberg vs. Bluffton |
| 56.90 | Oct. 21, 2022 | Keevan Lee | Baldwin Wallace Fall Duals |
| 57.70 | Oct. 8, 2022 | Keevan Lee | Manchester vs. Bluffton, Hanover |
