| Time | Date | Name | Meet |
|---|---|---|---|
| 47.85 | Nov. 21, 2025 | Jakson Winn | TYR/CMU Invitational |
| 48.10 | Nov. 17, 2023 | Luca Burns | TYR Colorado Mesa University Invite |
| 49.09 | Nov. 18, 2022 | Jakson Winn | TYR Colorado Mesa Inviational |
| 49.63 | Nov. 21, 2019 | Jerry Birnbaum | A3 Performance Invitational |
| 49.99 | March 11, 2011 | Andrew Zerwick | NCAA Division II Championships |
| 50.41 | Feb. 11, 2011 | Andrew Zerwick | Rocky Mountain Athletic Conference Championships |
| 50.94 | March 12, 2010 | Andrew Zerwick | NCAA Division II Championships |
| 51.73 | Feb. 13, 2010 | Andrew Zerwick | Rocky Mountain Athletic Conference Championship |
| 52.14 | Feb. 12, 2010 | Andrew Zerwick | Rocky Mountain Athletic Conference Championship |
| 52.45 | Feb. 11, 2010 | Andrew Zerwick | Rocky Mountain Athletic Conference Championship |
| 53.09 | Nov. 21, 2009 | Jacob Dole | Washington University Invitational |
| 53.58 | Nov. 7, 2009 | Jacob Dole | Colorado School of Mines vs. Colorado |
| 53.98 | Oct. 24, 2009 | Jacob Dole | Nebraska-Kearney vs. Colorado School of Mines, Morningside College |
| 54.11 | Oct. 16, 2009 | Jacob Dole | Rocky Mtn Invite |
