2007-08: Eriah Hayes played for the Topeka Roadrunners in the North American Hockey League. He was the team's fourth leading scorer, sharing the team lead in goals with 30 and also collected 26 assists in 53 games. He was +33 with 61 penalty minutes. Topeka finished first in the South Division and reached the NAHL playoff semifinal game against Mahoning Valley. Hayes scored 5 goals with 5 assists and was +2 with 6 penalty minutes in 12 playoff games.
2008-09: Hayes skated in the USHL as a 20-year-old. In 59 games with Waterloo he scored 27 goals with 18 assists and was +10 with 81 penalty minutes. The Black Hawks finished fourth in the Eastern Conference and were swept by first-place Green Bay in a first round series. Hayes scored 1 goal and was -3 with 4 penalty minutes in three playoff games. He committed to playing college hockey at Minnesota State in 2009-10.
2009-10: Hayes played in 38 of 39 games for Minnesota State in his freshman season. He scored 8 goals with 6 assists and was +5 with 59 penalty minutes. The Mavericks finished tied for eighth in the WCHA with Alaska-Anchorage and lost to St. Cloud State in a three-game first round playoff series.
2010-11: Hayes attended the Chicago Blackhawks' 2010 Prospect Camp before returning to Minnesota State for his sophomore season. He was the Mavericks' third-leading scorer with 11 goals and 11 assists in 38 games and was -2 with 52 penalty minutes. Minnesota State finished 11th in the WCHA and were swept by Denver in a first round playoff series.
2011-12: Hayes led Minnesota State in penalty minutes (83) and shared the team lead with 13 goals in his junior season. He also had 11 assists and was -13 in 36 games. The Mavericks finished 11th in the WCHA and lost to Minnesota-Duluth in a first round playoff series — falling to the defending national champion Bulldogs in double overtime in the second game.
2012-13: Hayes signed a two-year entry-level contract with San Jose as a free agent in April 2013 following his senior season at Minnesota State. He made his pro hockey debut with the AHL's Worcester Sharks, scoring 3 goals with 1 assist in seven games, and was +1 with 4 penalty minutes. The Sharks missed the AHL playoffs after finishing fourth in the Atlantic Division. Minnesota State had ts best season since joining the WCHA in 1999-00. A senior co-captain, Hayes led the Mavericks with 20 goals and had 16 assists in 41 games; finishing +1 with 51 penalty minutes. His 13 power-play goals ranked him second nationally. The Mavericks received an at-large bid to the NCAA tournament — falling 4-0 to Miami in the Midwest Regional semifinals.
Hayes is a rugged, hard-working, 6-4 and 210-pound power forward. Although Hayes is not afraid to mix things up, this season he has been able to strike a balance between his physicality and playing with discipline. He uses his size, strength, and reach to great advantage, particularly in tight areas and is difficult to move off of the puck. One attribute that has had scouts really taking notice of Hayes is his shot. He possesses one of the hardest shots in all of college hockey and he shoots with great frequency. He also has great finishing ability. What separates Hayes from many other top scorers, particularly among those with big bodies, is how little energy he expends when creating or finishing plays. His skating and puck movements often times look effortless, and he effectively utilizes his given time and space. Hayes moves really well for a man his size and skates with long, powerful strides. His leadership and ability to set the tone of a game were invaluable assets for Minnesota State-Mankato and they are qualities that Hayes could one day bring to his pro team.
Hayes signed an entry-level contract with the San Jose Sharks in April of 2013.