Eureka Springs has 3 amazing Mountain Biking Systems in town, and there are others in the region within a 30-minute drive.

Lake Leatherwood is the largest system in town, with 30 miles of trail, and includes Beginner Trails, highly technical Cross-Country Trails and the finest Downhill Trails in Arkansas. The Downhill Trails were built by Aaron Rogers of Rock-Solid contracting out of Copper Harbor, Michigan. Shuttles run Thursdays through Sundays, all year.
https://www.trailforks.com/region/lake-leatherwood-15744/
https://www.mtbproject.com/trail/6571533/lake-leatherwood

Black Bass Lake lies just south of Eureka’s Historic District and is home to more than 3 miles of Single Track, hand built by Ozarks Off-Road Cyclists. It features some of the nicest limestone bluffs in the area along with great views of the lake and its cut stone dam.
https://www.trailforks.com/region/black-bass-lake-13985/
https://www.mtbproject.com/directory/8011378/black-bass-lake

The Passion Play System is the newest in town and currently has 6 miles of trail surrounding the grounds. The trails were professionally built by Jagged Axe Trail Designs and Tony Boone. By the beginning of 2019, there will be 18 miles of riding available. With trail names like “Holy Roller” and “Atonement,” you are sure to have a religious experience.
https://www.trailforks.com/region/passion-play-24483/?lat=36.406608&lon=-93.722434&z=15&m=trailforks
https://www.mtbproject.com/directory/8020912/the-great-passion-play

Hobbs State Park is 20 miles south of Eureka and contains almost 20 miles of ribbony trail. State Parks is adding another 20 miles of trail built by Rogue Trails. Hobbs is the best place to ride when it is wet and the new trails are filled with flow.
https://www.trailforks.com/region/hobbs-state-park-18421/
https://www.mtbproject.com/directory/8007074/hobbs-state-park-conservation-area