Catherine "Cat" Aucoin was born on August 19, 2003 in Colorado to Jill and Joe Aucoin. She has two sisters, Diane and Lily. Lily is also a competitive gymnast at Austin Elite Gymnastics. Cat is an honor student at Lake Travis High School and she will graduate in 2021. She was #3 in her class during her freshman and sophomore years at Faith Christian Academy in Colorado. Cat has over 48 hours of community service hours including painting old fences at farms, boxing at Operation Christmas Child, unloading food at church, etc.
Cat started taking gymnastics classes at a local gym in Colorado for fun when she was five years old in 2008. As a level 7 gymnast in 2016, Cat placed second in the all-around with a 37.975, first on uneven bars with a 9.800 and second on uneven bars scoring a 9.450. She moved up to level 8 for the 2017 season where she placed eighth in the all-around with a 37.125 at the Region 3 Championships.
Following her 2019 season, Cat and her family relocated to Texas, so she started training at Austin Elite Gymnastics. In 2020 as a second-year level 10 gymnast, Cat qualified to the State Championships but was unable to compete due to COVID-19 pandemic.