Join Silverton Mountain Guides Alaska Heli for the ultimate Alaska helicopter skiing and snowboarding experience in the Northern Chugach Mountains. or Petersburg, AK. Experience Alaska heli skiing and snowboarding in what we consider THE ZONE the Northern Chugach. Multiple 6 Day/5 Night packages are available in March and April, as well as Private Helicopter options. The Private Helicopter experience allows clients to enjoy heli skiing in Alaska with just you, your friends and the helicopter.