Cass is way too far away. There is a track in Heber Springs. Not one of the best I've ridden on, but good enough. Too bad you are so far East. There is a couple of pretty decent ones West of you. One in Dora, OK, just across the OK stateline on I-40. And one in Pea Ridge (north of Fayetteville). There are two a couple hours east of Fort Smith (I can't remember the town, Arkansas Tech is there).
White Rock in Cass (just outside Fayetteville) is an excellent riding area! I wish I had ridden there more when I only lived an hour away! I wish I knew then what I know now.