South of Bern and south of Sion, the Evolene Ski Area has 11 pistes totaling 40km spread over 50 acres that are served by 4 lifts accessing a maximum vertical descent of 1,276m. There are challenging freeride routes down from Vouasson and arbey to Lannaz base. Also, there is a backcountry route up and over Mandelon Pass.
The Evolene ski area is part of the greater Espace Dent Blanche ski region which also includes Arolla and La Forclaz. There are a total of 100km of pistes. These ski areas are interconnected by bus only.
To reach the snowboarding at Evolene, take the train from Geneva, Bern or Zurich to Sion. From Sion, there is a public post bus up to Evolene.
Note: If you plan to head to Evolene for snowboarding by train, here are two great options offered by the Swiss train system SBB. First, there is the discounted Swiss Transfer Ticket which provides a round-trip train ticket from an airport directly to the town near the ski area, plus 50% off any additional train or bus tickets. Second, there is the Snow-N-Rail ticket which provides a round-trip ticket from anywhere in Switzerland combines with a ski lift pass for as long as you need at a total 20% discount (see: http://www.sbb.ch/snownrail ).
Overall, Evolene is the 53rd most popular snowboard & freeride destination of all 68 snowboarding resorts in Switzerland.