The National Hockey League (NHL) first held a regular season outdoor ice hockey game in 2003, and since 2008 the league has scheduled at least one per year.
The 2012 Winter Classic at Citizens Bank Park in Philadelphia
The inaugural Winter Classic was played at Ralph Wilson Stadium in Buffalo, New York
The 2019 NHL Stadium Series was held at Lincoln Financial Field in Philadelphia, Pennsylvania
The 2019 Heritage Classic at Mosaic Stadium in Regina, Saskatchewan, was the first Heritage Classic held outside the locales the participants are based in
The NHL Heritage Classic is one of the series of regular season outdoor games played in the National Hockey League (NHL) that is held in football stadiums based in Canada. Unlike the NHL's other two series of outdoor games, the NHL Winter Classic and the NHL Stadium Series, the Heritage Classic has been held infrequently: only seven games have been played in the series so far, and the first five match-ups were exclusively between Canadian teams.
The 2019 Heritage Classic was hosted in Mosaic Stadium, the first time it has been hosted outside the locale the participating teams are based in