Oona Brown started skating at age 4. She and her brother, Gage, were paired up as an ice dance team in 2016. At the intermediate level, they placed 4th at their first Eastern Sectionals, and 12th at the 2017 U.S. championships. They moved up to the novice level for the 2017–18 season, placing 1st their next sectional championships, and 5th 2018 U.S. championships. They made their international debut at the 2018 Bavarian Open, where they competed in the advanced novice competition and placed 3rd.