2018 ULTRA4 Series Schedule February 2nd – 10th – King of The Hammers 2018, Johnson Valley, CA April 13th & 14th – AOAA Park Coal Township, PA – Eastern Series May 11th & 12th – Prairie City SVRA, Rancho Cordova, CA – Western Series June 15th & 16th – Cross Bar Ranch, Davis, OK – East/West Combined July 20th & 21st –… Continue reading ULTRA4 Schedule and KOH Registration Now Available