| Time | Date | Name | Meet |
|---|---|---|---|
| 43.28 | May 3, 2023 | Rex Maurer | CIF-SS Division 1 Championships |
| 43.76 | May 4, 2022 | Rex Maurer | CIF-SS Division 1 Championships |
| 43.95 | May 2, 2019 | Connor Lee | CIF Southern - Division 1 Section Championship |
| 44.43 | May 10, 2012 | Fred Abramyan | 12 California Boys & Girls Southern - Div 1 Section Championships |
| 45.08 | May 11, 2011 | Fred Abramyan | California Boys & Girls Southern - Div 1 Section Championships |
| 45.69 | May 8, 2007 | Kevin Kuhn | CIF-SS Division II Championships |
| 47.92 | May 12, 2004 | James Banks | CIF DIV I |
