March 20 to May 22, 2025

Registration period and recording of the preliminary round.

August 25, 2025

Announcement of the preliminary round results.

Week of November 10, 2025

Semifinal rounds and training activities for the semifinalists.

November 15, 2025

Grand Finale of the 86th OSM Competition, powered by Air Canada, followed by the awards ceremony at the Maison symphonique de Montréal.