The 15-year-old from Cashmere High School also eclipsed 27 other girls to complete the 300m swim, 10km cycle and 3km run in 37min 05sec last week in Wanaka.
Morgan was 10th overall out of 55 boys and girls in her age group.
Morgan competed the 300m swim in 5min 22sec and then powered into the bike leg where she completed the 10km in 17min 28sec.
Her 3km run took her 11min 14sec.
She beat St Kentigern College’s Sophie Spencer by 16sec, with Mt Aspiring College’s Hannah Prosser a further 8sec back in third.
Several other Canterbury athletes did well. Rangiora High School's Quade Mclachlan won the under-16 boys category, while Christchurch Boys’ High School student Archie Bordewich finished fourth and Lincoln High School’s Benjamin Airey was ninth.
Medbury School’s Oli Aitken won the under-13 boys category. He completed the 200m swim 5km bike and 2km run in 24min 11sec.
Hillview Christian School’s Silas Young was fourth in the same grade 26sec behind Oli. Medbury’s Henry Hiatt was fifth.
CBHS student Will Allott was seventh and Cathedral Grammar’s Dardy Harrington was 10th.
Selwyn House’s Charlotte Chiles finished seventh in the girls intermediate race while St Andrew’s College’s Amber De Wit was eighth.
Christ’s College’s Art Aitken finished second in the under-14 boys race.
His time of 37min 42sec was 72sec behind winner Lucas Reed from Palmerston North Boys’ High School.
Rangi Ruru’s Lily Greenwood won the girls under-14 race, completing the 300m swim, 10km bike ride and 3km run in 39min 23sec.
She was more than a minute clear of her nearest rival, Lucy McLean, from Palmerston North Girls’ High School.
St Bede’s Ethan Beetar finished 10th in the boys under-14 race.
CGHS Sienna O’Brien finished seventh in the girls’ race.
Medbury School also dominated both the boys and mixed tag-team relays.
