In the 1997 OWIAA semifinal, Hefford was part of the Varsity Blues squad which defeated the Guelph Gryphons by a 4–1 tally.

OWIAA league rules indicated that the first five-minute overtime session in a playoff game must be played in its entirety (as a regular period).

[9] At the 2010 Olympics in Vancouver, Hefford ranked second on Team Canada with 12 points (5 goals, 7 assists) in 5 games on the way to her fourth medal (third gold).

[10] Her two third period goals in the 2000 championship game pushed the contest into overtime, allowing Canada the opportunity to win.

[14] In the first game of the 2011 IIHF Eight Nations Tournament, Hefford registered a hat trick in a 16–0 victory over Switzerland.

[17] In a game versus Russia at the 2012 IIHF Women's World Championship, Hefford registered a four-point performance (two goals, two assists) in a 14–1 victory.

[19] After 17 years, four Olympic gold medals and multiple world championships, she retired from the national women's team at age 38, after sitting out the 2014–2015 season.

[20] Jayna Hefford made her senior competitive debut with the Mississauga Chiefs in 1996–97, scoring 32 goals in 30 games and winning Rookie of the Year honours in the Central Ontario Women's Hockey League.

In 2006–07, Hefford eclipsed the 40-goal plateau for the second time in her NWHL career, also leading the league with a career-best 70 points.

In 2007–08, she led the new Canadian Women's Hockey League (CWHL) with 26 goals in 27 games for the Brampton Canadettes Thunder.

It marked the first time since 1999–2000 that in a year when Hefford played a full season, she did not win her league scoring race.

In 2009–10, she was absent from the Brampton Thunder for most of the season due to the centralization of Canada's women's hockey Olympic team.

This is team captain Jayna Hefford's hometown and she scored a goal in front of her closest friends, family and fans.

In addition, her number 15 was raised to the rafters of the Invista Centre on behalf of the Kingston Area Minor Hockey Association.

Announced on July 19, 2018, replacing inaugural commissioner Brenda Andress, Hefford took on the role on August 1, 2018.

On Jan. 28, 2025, Hefford was promoted to Executive Vice President of Hockey Operations, with the league expressing its intention to continue to grow.

[26] Hefford was raised by her parents Larry and Sandra along with her brother Mike; she calls Kingston, Ontario her home town.

[9] Hefford is mother to two daughters, Isla and Arwen, and a son, Lachlan,[2][27] with her partner, former Team USA Olympian and Canadian Women's Hockey League co-founder Kathleen Kauth.