He led all rookies with 16 points (seven goals, nine assists) in 15 games, to edge Ottawa Senators right-winger Mark Stone. Stone had four goals and 11 assists in 16 games in March.
Boston Bruins teammates Ryan Spooner (7-7-14 in 15 games) and David Pastrnak (3-10-13 in 15 games), Carolina Hurricanes centre Victor Rask (3-8-11 in 15 games), and Anaheim Ducks goaltender John Gibson (6-2-0, 2.50 goals-against average and .918 save percentage) were also considered for the honour.
Gaudreau, a fourth-round selection by the Flames in the 2011 NHL Draft, recorded at least one point in 10 of his 15 March appearances, highlighted by four multi-point games. He is in first place in rookie scoring with 22 goals and 38 assists.
Gaudreau also earned the rookie of the month award in December.