2009-10: Francois Tremblay skated for the Jonquiere Elites midget AAA team in Quebec. In 25 games he was 12-8-3 and had a 3.12 goals against and .902 save percentage. Jonquiere finished tenth in the 15-team league. Tremblay was selected by Val-d'Or in the first round (fourth overall) of the 2010 QMJHL Entry Draft.
2010-11: Tremblay appeared in 26 games in his first season with the QMJHL's Val-d'Or Foreurs and represented Canada Quebec in the 2011 U17 World Hockey Challenge. As a backup to starter Jacob Gervais-Chouinard, Tremblay was 5-14 with a 3.91 goals against and .869 save percentage. The Foreurs reached the playoffs after finishing fifth in the West and were swept in the first round of the playoffs by Quebec. Tremblay played in three playoff games and was 0-2 with a 6.20 goals against and .841 save percentage. In five games at the WHC with Canada Quebec he was 1-2 with a 3.38 goals against and .872 save percentage. Tremblay was one of 16 goalies selected to participate in Hockey Canada's Program of Excellence in June.
2011-12: Tremblay took over as the starter in Val-d'Or, skating in 57 games for the Foreurs. He was 22-32 with two shutouts and had a 3.79 goals against and .882 save percentage. Val-d'Or finished second in the West Division but was swept by Rimouski in a first round playoff series. Tremblay played in all four games and was 0-3 with one loss in overtime and had a 5.45 goals against and .839 save percentage. Tremblay was invited to the NHL Draft Combine and was ranked fifth amongst North American goalies in Central Scouting's final rankings prior to the 2012 NHL Draft.
2012-13: Tremblay played 46 games for Val-d'Or in his third QMJHL season but was replaced as the Foreurs' starter late in the year by trade deadline acquisition Philippe Trudeau. Tremblay was 22-16-3 with a 3.42 goals against and .894 save percentage. After getting off to a slow start and changing coaches, Val-d'Or finished fourth in the West Division and reached the second round in the playoffs. Trudeau started all 10 playoff games and in two appearances Tremblay stopped 20 of 25 shots in 41 minutes of action; finishing with a 7.21 goals against and .800 save percentage in the playoffs.
A big goalie who naturally covers a large part of the net, Tremblay plays a sound positional style. Always square to the shooter, he controls rebounds well and has a good glove hand. Plays a calm and focused game in between the pipes, but needs to continue to improve his quickness in the crease. Tremblay saw a lot of action for Val d'Or and handled it well.
Acquired via trade from Val d'Or on New Year's Eve, Tremblay will play out the 2013-14 season and playoffs with the Victoriaville Tigres.