| 13 years |
| Aust Age: | 59.14 | *Yolane Kukla (St Pet West, QLD) | 8 Aug 2009 |
| Age AllComer: | 59.14 | *Yolane Kukla (St Pet West, QLD) | 3 Aug 2009 |
| WA All Comer: | 1:01.14 | Kate Harrison (St Hilda's, WA) | 3 Sep 2017 |
| WA All Time: | 1:01.14 | Kate Harrison (St Hilda's, WA) | 3 Sep 2017 |
| WA Resident: | 1:01.14 | Kate Harrison (St Hilda's, WA) | 3 Sep 2017 |
|
| # | Name | Age | School | Entry | Result | | Points |
| 1st | Barnett, Jasper | 13 | Unattached WA | 1:07.14 | 1:04.75 | -2.39s | 10 |
| 2nd | Haywood, Anzu | 13 | Highlanders | 1:10.25 | 1:07.30 | -2.95s | 8 |
| 3rd | Dimitriadou-Pierce, Melina | 13 | Fenix Swim Club Inc. | 1:08.64 | 1:09.30 | +0.66s | 6 |
| 4th | Weglinska, Weronika | 13 | UWA-West Coast Swimming Club | 1:12.57 | 1:10.15 | -2.42s | 5 |
| 5th | Matias, Ariana | 13 | UWA-West Coast Swimming Club | 1:13.29 | 1:11.42 | -1.87s | 4 |
| 6th | Payne, Tilly | 13 | South Lake Dolphins | 1:15.97 | 1:12.14 | -3.83s | 3 |
| 7th | Cheeseman, Audrey | 13 | South Lake Dolphins | 1:15.07 | 1:12.39 | -2.68s | 2 |
| 8th | St Quintin, Poppy | 13 | Southside Penrhos Wesley Swimm | 1:14.61 | 1:12.49 | -2.12s | 1 |
| 9th | Matthews, Madelene | 13 | Southside Penrhos Wesley Swimm | 1:15.78 | 1:13.92 | -1.86s | |
| 10th | Slevin, Charli | 13 | Breakers WA | 1:18.34 | 1:14.57 | -3.77s | |
| 11th | Odendaal, Aimee | 13 | Celts Swimming Club | 1:17.85 | 1:14.92 | -2.93s | |
| 12th | Mazurek, Mary | 13 | South Shore | 1:16.59 | 1:14.95 | -1.64s | |
| 13th | Grant, Neve | 13 | Westside Christ Church Aquatic | 1:15.19 | 1:15.03 | -0.16s | |
| 14th | Andrews, Star | 13 | South Shore | 1:17.78 | 1:15.66 | -2.12s | |
| 15th | Teope-Cuccovia, Julia | 13 | Southside Penrhos Wesley Swimm | 1:17.05 | 1:16.76 | -0.29s | |
| 14 years |
| Aust Age: | 58.25 | *Yolane Kukla (St Pet West, QLD) | 14 Jul 2010 |
| Age AllComer: | 58.25 | *Yolane Kukla (St Pet West, QLD) | 14 Jul 2010 |
| WA All Comer: | 1:00.66 | Lucia Lassman (Chandler, QLD) | 15 Sep 2012 |
| WA All Time: | 1:00.68 | Kate Harrison (St Hilda's, WA) | 25 Aug 2018 |
| WA Resident: | 1:00.68 | Kate Harrison (St Hilda's, WA) | 25 Aug 2018 |
|
| # | Name | Age | School | Entry | Result | | Points |
| 1st | Curnow, Georgina | 14 | Highlanders | 1:07.46 | 1:06.78 | -0.68s | 10 |
| 2nd | Wilson, Lua | 14 | Westside Christ Church Aquatic | 1:07.28 | 1:07.11 | -0.17s | 8 |
| 3rd | Ross, Amberlie | 14 | Highlanders | 1:08.01 | 1:08.10 | +0.09s | 6 |
| 4th | Van Der Wal (V), Nadia | 14 | Klim Swim Club | 1:11.21 | 1:09.37 | -1.84s | 5 |
| 5th | Hewlett-Banning, Maddison | 14 | Guildford & Kalamunda District | 1:10.24 | 1:09.79 | -0.45s | 4 |
| 6th | Cappati, Sophie | 14 | Highlanders | 1:11.97 | 1:09.93 | -2.04s | 3 |
| 7th | Ung, Angelina | 14 | Riverton Aquanauts Incorporate | 1:10.04 | 1:10.39 | +0.35s | 2 |
| 8th | Foster, Ella | 14 | North Coast Swim Club | 1:14.22 | 1:12.95 | -1.27s | 1 |
| 9th | Klopper, Minet | 14 | Fenix Swim Club Inc. | 1:15.88 | 1:14.41 | -1.47s | |
| Bowman, Lily | 14 | Western Sprint Swimming Club | 1:15.85 | 1:16.61 | +0.76s | |