Southeast of Zurich and southwest of Chur, the Splugen ski area has 30km of pistes served by 6 lifts.
Note: If you plan to head to Splugen 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, Splugen is the 48th most popular snowboard & freeride destination of all 68 snowboarding resorts in Switzerland.