The Arbuckle 100 is a 10K, 20M, 40M, 100K, and 100 Mile trail run held on Crossbar Ranch nestled in the Arbuckle Wilderness located in southern Oklahoma. Featuring rocky ATV trails and dirt jeep roads. This is, in the Race Director's opinion, the roughest terrain you will find in Oklahoma. The Crossbar Ranch website will tell you in bold letters (This Ain't Your Grandma's Backyard.) This is a 20-mile loop beginning and ending at the Crossbar Ranch entrance.