| Time | Date | Name | Meet |
|---|---|---|---|
| 48.22 | March 9, 2023 | Charles Burroughs | NCAA Division II Championship |
| 48.31 | Nov. 18, 2022 | Charles Burroughs | TYR Colorado Mesa Inviational |
| 48.38 | Feb. 10, 2022 | Charles Burroughs | Rocky Mountain Athletic Conference Championships |
| 48.52 | Feb. 18, 2021 | Jerry Birnbaum | Rocky Mountain Athletic Conference Championships |
| 48.83 | Feb. 13, 2020 | Charles Burroughs | Rocky Mountain Athletic Conference Championships |
| 49.26 | Nov. 22, 2019 | Charles Burroughs | A3 Performance Invitational |
| 49.41 | Feb. 9, 2017 | Josh Schechter | Rocky Mountain Athletic Conference Championships |
| 50.13 | Feb. 12, 2015 | Josh Schechter | Rocky Mountain Athletic Conference Championships |
| 50.67 | Feb. 12, 2010 | Brian Coates | Rocky Mountain Athletic Conference Championship |
| 52.88 | Nov. 21, 2009 | Sergey Piletski | Washington University Invitational |
| 53.74 | Oct. 24, 2009 | Brian Coates | Nebraska-Kearney vs. Colorado School of Mines, Morningside College |
| 54.62 | Oct. 9, 2009 | Sergey Piletski | 5-way Dual (CSM, MSC, ASC, CU, MSCD) |
