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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 56.69 | July 16, 2021 | Nathan Quaterman | Boise YMCA | Speedo Sectionals - Austin, TX (WRS) |
| 57.76 | Dec. 10, 2019 | Nathan Quaterman | Boise YMCA | Speedo Junior National West - LCM Time Trials |
| 57.97 | Aug. 3, 2018 | Jackson Cunningham | Boise YMCA | Speedo Junior National Championships |
| 58.34 | July 14, 2018 | Nathan Quaterman | Boise YMCA | Speedo Champions Series - Mount Hood |
| 58.41 | Aug. 11, 2017 | Jackson Cunningham | Boise YMCA | Speedo Junior National Championships |
| 58.62 | July 19, 2013 | Barkley Bursch | Tiger Aquatic Club (ID) | Speedo Champions Series - Mount Hood |
| 58.99 | Aug. 11, 2011 | Barkley Bursch | Tiger Aquatic Club (ID) | Speedo Junior National Championships |
| 1:01.10 | June 10, 2004 | Sam Masson | Boise YMCA | Janet Evans Invitational |
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