| Time | Date | Name | Meet |
|---|---|---|---|
| 47.75 | Dec. 9, 2022 | Jeremy Kelly | Speedo Winter Junior Championship West |
| 47.89 | Dec. 8, 2022 | Jeremy Kelly | Speedo Winter Junior Championship West |
| 48.40 | March 5, 2022 | Logan Walker | Speedo Sectionals - College Station |
| 48.50 | Dec. 9, 2021 | Logan Walker | Speedo Winter Junior Championship West |
| 48.57 | March 3, 2018 | Ike Gwin | Speedo Champions Series - Southern - College Station |
| 48.70 | Dec. 8, 2017 | Ike Gwin | Speedo Winter Junior Championships - West |
| 48.74 | March 4, 2017 | Ike Gwin | South Texas Age Group Championship |
| 48.78 | Dec. 9, 2016 | Ike Gwin | Speedo Winter Junior Championships - West |
| 48.89 | Dec. 8, 2016 | Ike Gwin | Speedo Winter Junior Championships - West |
| 49.39 | March 5, 2015 | Sean Grieshop | American Short Course Championships |
| 49.98 | March 2, 2014 | Sean Grieshop | Speedo Champions Series - College Station, TX |
| 50.39 | Dec. 10, 2009 | Nick Allen | Speedo Junior Nationals |
| 50.85 | March 20, 2009 | Nick Allen | NCSA Jr Nationals- Time Trials |
| 51.72 | March 23, 2007 | Anders Storvik | NCSA Junior Nationals |
| 52.51 | Dec. 2, 2006 | Anders Storvik | Gator Holiday Classic |
| 54.10 | Dec. 1, 2006 | Anders Storvik | Gator Holiday Classic |
