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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 46.05 | Dec. 15, 2018 | Roman Sawyer | Lake Monsters | MT Holiday Championship |
| 46.63 | Feb. 23, 2018 | Preston Martinson | Billings YMCA Seahawks | Montana Swimming Short Course Championships |
| 47.88 | Nov. 8, 2014 | Jesse McCormick | Missoula YMCA Swim Team | MT MAC Fall Invitational |
| 50.44 | March 7, 2014 | Wesley Dennison | Missoula Aquatic Club | Montana Swimming Short Course Championships |
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