Senior hockey in Hradec Kralove dates back to 1925, with one season in the top flight for HC Královští lvi Hradec Králové in 1993/1994. Mountfield HK made their Extraliga debut in 2012/13, after Mountfield, who owned the license to compete in the league, moved the team from České Budějovice and merged them with Královští lvi.

Since the move to Hradec Králové, the team has averaged around 5,000 people at their home games, and built up an Eastern-Bohemian rivalry with Dynamo Pardubice, as the cities are just 19 km apart from each other.

After three straight seasons ending in quarter-final losses, Mountfield got through to the semi-finals in both 2017 and 2018. In 2019, they finished fourth in the regular season but were then swept by Kometa Brno in the quarter-finals. 

The team has taken part in the prestigious Spengler Cup twice and played in the CHL three times.

In 2019/20, Mountfield HK made it all the way to the CHL Final and hosted the event in the Czech Republic for the very first time. They lost the Final to Frölunda Gothenburg 1-3.