The Stadium Series is one of the series of regular season outdoor games played in the National Hockey League (NHL). This event is distinct from the NHL's other two series of outdoor games, the NHL Winter Classic played on New Year's Day in a different NHL city every year, and the NHL Heritage Classic. Games in the Stadium Series have been held in either late January, February, or early March in a football or baseball stadium in the United States. The first Stadium Series was held in 2014 and consisted of seven teams participating in four games held in three venues. In 2015, only one game in the Stadium Series was held, while in 2016 and in 2024, two games were held. From 2017 to 2023 and again in 2025, only one game was scheduled per year.
Dodger Stadium being prepped for the NHL's inaugural game of the Stadium Series in January 2014
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