 On March 6, 2010, Stewart recorded his first career hat trick against the St. Louis Blues in a 7–3 win, scoring two goals against Chris Mason, followed by a penalty shot goal against Ty Conklin, while adding an assist to finish with a career-high four points in a game.He finished the season leading the Avalanche with 28 goals, while finishing second in team scoring with 64 points, helping the club into the 2010 playoffs.Stewart played in his first Stanley Cup playoff game on April 14, 2010, scoring a goal with 50 seconds left in the game against Evgeni Nabokov of the San Jose Sharks in a 2–1 Colorado win.