In 1998-99, she was the top rookie for the McGill Martlets women's ice hockey team. She was also the first woman in Canadian Interuniversity Sports history to win a men’s regular season game when McGill University defeated Ryerson University on November 15, 2003 by a score of 5-2.
Kim St. Pierre was the goaltender for Team Canada in the 2002 Salt Lake City Olympics, and was the starting goaltender in Team Canada's 3-2 victory over Team USA in the gold medal final. She also played for the Canadian women's team in Turin. St. Pierre holds numerous records in international competition, including most shutouts (15), most wins (24), and lowestgoals against average (0.84). She received a gold medal in the Women's Hockey game at the 2010 Vancouver Winter Olympics.
She currently plays for the Montreal Stars of the Canadian Women's Hockey League. In 2007-08, she was voted the CWHL Top Goaltender and a CWHL Eastern All-Star. By winning the 2009 Clarkson Cup, St. Pierre became an unofficial member of the Triple Gold Club (the accomplishment by women is not yet officially recognized by the IIHF), as she became one of only three women to win the Clarkson Cup, an Olympic gold medal (in ice hockey at the 2002 Winter Olympics, ice hockey at the 2006 Winter Olympics, and ice hockey at the 2010 Winter Olympics), and a gold medal at the IIHF women's world hockey championships.
She is currently a CAN Fund recipient and plans to run a 5k at Ottawa Race Weekend on May 29, 2010. On September 22, 2011, St. Pierre made the announcement that she was taking off the 2011–12 Canada women's national ice hockey team season (along with the Stars season) to have a baby. This has led to an opening for a third goaltender on the squad. Christina Kessler and Genevieve Lacasse are being considered as possible replacements.
St. Pierre made women's ice hockey history on October 23, 2008, when she tended goal during a practice session with the Montreal Canadiens at Denis Savard Arena. Carey Price was out with the flu. She was the second woman in NHL history to play alongside NHL players, since Manon Rheaume in an exhibition game. Wearing her usual #33 jersey, Alexei Kovalev put a wrist shot past her ear and Francis Bouillon blasted a slapshot that just missed her mask and deflected off the crossbar. St.Pierre referred to the experience as "priceless".
- CWHL Top Goaltender, 2007–08 and 2008–09
- CWHL First All-Star Team, 2008–09
- CWHL Eastern All-Stars, 2007–08
- CIAU Championship game Most Valuable Player in 2000
- CIS Most Outstanding Player in 2003
- Most Valuable Player, 2002 Esso Women's Nationals
- Top Goaltender at the 2001 World Championships
- Top Goaltender at the 2004 World Championships
- Top Goaltender at the 2002 Winter Olympics
- Top Goaltender at the 2002 Esso Canadian National Championship