| Time | Date | Name | Meet |
|---|---|---|---|
| 47.94 | May 12, 2023 | Max Cahill | CIF State Championships |
| 48.30 | May 13, 2022 | Max Cahill | CIF State Championship |
| 48.37 | May 10, 2019 | Mark McCrary | California CIF State Championship |
| 48.94 | May 10, 2018 | Mark McCrary | CIF Sac Joaquin Section Championship |
| 50.22 | May 12, 2016 | Nick Bell | California CIF Southern - Div 1 Section Championships |
| 50.43 | May 14, 2015 | Sam Jo | 15 California Southern - Div 1 Section Championships |
| 51.21 | May 15, 2014 | Sam Jo | 14 California Southern - Div 1 Section Championships |
| 51.62 | May 10, 2012 | Corey John | 12 California Boys & Girls Southern - Div 1 Section Championships |
| 51.70 | May 11, 2011 | Ryan Cunningham | California Boys & Girls Southern - Div 1 Section Championships |
| 53.39 | May 12, 2004 | Aaron Casey | CIF DIV I |
