| Time | Date | Name | Meet |
|---|---|---|---|
| 45.83 | Feb. 17, 2018 | Ryan Linnihan | WIAA Boys Division 1 State Championships |
| 46.38 | Feb. 18, 2017 | Ryan Linnihan | Wisconsin Boys Division 1 State Championships |
| 47.32 | Jan. 25, 2017 | Ryan Linnihan | Wisconsin Pre-Sectional Times |
| 47.41 | Feb. 20, 2016 | Ryan Linnihan | Wisconsin Boys Division 1 State Championships |
| 48.00 | Feb. 13, 2016 | Ryan Linnihan | WIAA Boys Division 1 Sectional - Homestead |
| 48.91 | Feb. 14, 2013 | Joe Bauer | 13 Wisconsin Boys High School Best Times |
