Vermont’s Killington Resort (link is external), the largest mountain resort in Eastern North America and a POWDR company, today announced registration is open for the 2018 Fox US Open of Mountain Biking on August 1-5, 2018 and spectators are invited to attend for free. The Fox US Open features a Pro/Am style format and offers the most challenging and competitive racing in the nation, setting the standard as a proving ground for up-and-coming and elite racers. Anyone can enter the Open Class and compete amongst the pros for the $40,000 cash purse. The Amateur Class, Grom Bomb Downhill and the US Open Adaptive DH races will give athletes of all abilities the chance to compete during the US Open weekend.