Barron was a late call-up to the Ireland U20 squad for the 2017 World Rugby Under 20 Championship, and made his debut for the team in their tournament opener against Italy U20, though a thumb injury suffered just 20 minutes into the game ended Barron's tournament. He went on to represent Ireland U20 during the 2018 Six Nations Under 20s Championship and 2018 World Rugby Under 20 Championship.