2007-2008
Sarah Vaillancourt had a standout year with the Harvard Crimson. The team became only the second in Eastern College Athletic Conference history to go undefeated against conference opponents (22-0-0).

In the NCAA Frozen Four, Vaillancourt and the Crimson were eliminated by the Wisconsin Badgers. It was only their second loss of a season in which Vaillancourt won the Patty Kazmaier Award as the top female college hockey player in the country. (She led the Crimson in almost every offensive category: goals, assists, points, short handed goals, shots, plus/minus, game-winning goals.)

In April, Vaillancourt helped Canada earn silver at the 2008 World Women's Hockey Championship in Harbin, China. The Canadians lost to the Americans 4-3 in the final, and Vaillancourt had four goals in five games, including the first Canadian goal in the final.

2006-2007
After taking a year off from Harvard due to Team Canada's preparation for the 2006 Olympics, Vaillancourt returned to Harvard for her sophomore year.

She led the team in goals but finished second in team scoring behind American Julie Chu. The Wisconsin Badgers once again ended the Crimson's season, this time with a 1-0 loss in the fourth overtime period of the NCAA Frozen Four quarter-finals. The Badgers went on to win the national championship.

In the quarter final, Vaillancourt faced fellow Team Canada members Bobby Jo Slusar and Meaghan Mikkelson, paired on defence for Wisconsin.
Vaillancourt was named a Second Team All-American and one of 10 finalists for the Patty Kazmaier Award.

2005-2006
Vaillancourt won a gold medal with Team Canada at the Turin Games, scoring two goals, three assists and five points.

She took the year off from Harvard due to Team Canada's preparation for the 2006 Olympics. The team was stationed in Calgary and played a series of pre-Olympic games. Vaillancourt played in 10 pre-Olympic games, scoring one goal and adding three assists. 

2004-2005
In her freshman year at Harvard, Vaillancourt scored 25 goals and had 67 points in 29 games. She also led the team in penalty minutes.

Harvard made it to their second consecutive final of the Frozen Four but for the second  consecutive year lost to the University of Minnesota.

Vaillancourt was named to the Frozen Four All-Tournament Team as a rookie. She also took home the Ivy League and ECAC Rookie of the Year awards for her freshman efforts.

2003-2004
Vaillancourt was the captain in her second and final year of high school hockey at Pomfret Prep School in rural southern Connecticut. She scored 49 goals and finished the year with 133 point.

2002-2003
Determined to earn a hockey scholarship to a top American university, Vaillancourt moved to southern Connecticut and enrolled in Pomfret Prep School to help develop her English skills and play school hockey.

In her first year, the team won the silver medal at the 2003 U.S. National Championship and Vaillancourt was named a New England U.S. Prep School All-Star.