Men's and Women's Initially, teams would qualify through final rankings at the previous year's championships. If teams did not automatically qualify, they would compete through regional qualifiers. In the Europe Zone, teams participated in the
European Junior Curling Challenge, in which the winner advances to the World Championships. In the Pacific Zone, teams participated in the
Pacific-Asia Junior Curling Championships, in which the winner advances to the World Championships. Starting in 2016, teams who did not qualify through final rankings at the previous year's championships would compete at the
World Junior-B Curling Championships, which includes any teams that did not already qualify for the championships via the previous year's rankings. The top three teams of this tournament qualify for the main tournament, and the bottom three teams from the main tournament are then demoted to the B tournament. This type of tournament also existed from 2001 to 2004, where two teams were awarded qualification spots through the B tournament instead of three. From 2027 onward, the World Junior Curling Championships was revamped by World Curling and underwent significant changes. The event expanded to 16 teams per gender, in which two pools of eight teams would compete in a round-robin format, with the top three teams from each pool advancing to the play-offs, while the bottom three teams overall are relegated to the World Junior-B Curling Championships. Additionally, games were shortened from ten ends to eight ends.
Mixed doubles The mixed doubles world junior championship continues to be an open-entry championship, open to any member association. ==Summary==