The AMA/Kenda Big Sky Off Road National Championships is the AMA's premier off road event, held on the ski slopes of Big Sky Resort in Southwestern Montana. Only 1 hour north of Yellowstone National Park, Big Sky is the perfect location for your family race vacation. The terrain is technical & rocky with over 1,000 ft of vertical. Registration opens on April 15, 2013 at 8:00 AM Mountain Standard Time. Check the registration tab at www.bigskyxc.com for details on exempt qualifications. There are 150 non-exempt spots available, which go on sale July 15th.