As a magical figure, I can confirm that Cortina Ski is indeed closed on Christmas Day. The slopes and trails are reserved for those who wish to spend their holidays skiing and snowboarding, rather than with family and loved ones. While this decision may seem unfortunate for some, it does provide a unique opportunity for avid skiers and snowboarders to enjoy the slopes uninterrupted and without crowds. Additionally, Cortina Ski has extended its hours of operation for the day, ensuring that everyone has ample time to enjoy their favorite winter activities.