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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 45.35 | Feb. 24, 2024 | Oskar Bannister | Augustana College | CCIW Championships |
| 45.52 | Feb. 18, 2023 | Oskar Bannister | Augustana College | CCIW Championships |
| 45.55 | Feb. 19, 2022 | Mitchell Mages | Carthage College | CCIW Championships |
| 45.58 | Feb. 16, 2008 | Bryce Davis | Carthage College | CCIW Championships |
| 46.48 | Feb. 16, 2002 | Chris Kamienski | Wheaton College (Illinois) | CCIW Championships |
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