The 2023 Tim Hortons NHL Heritage Classic is set to feature the Calgary Flames and Edmonton Oilers. It will celebrate the 20-year anniversary of hosting the first-ever NHL regular-season outdoor game in the 2003 NHL Heritage Classic, a 4-3 win for the Montreal Canadiens over the Oilers in front of 57,167 fans on November 23, 2003. Including that game, there have been 37 regular-season outdoor games played to date, attended by 1,851,642 fans. The Flames-Oilers outdoor matchup will mark the seventh NHL Heritage Classic, which includes the inaugural game in Edmonton (2003), as well as games in Calgary (2011), Vancouver (2014), Winnipeg (2016), Regina (2019) and Hamilton (2022).