The Underground Circus 100

The Underground Circus 100 is a versatile ultrarunning event held in Smyrna, Georgia, along the scenic Silver Comet Trail. Offering distances from 6 hours up to 100 miles, including timed events of 24, 48 hours, and various mile options, the course features a fast, relatively flat asphalt route with adjacent grassy trails through wooded areas. The out-and-back course spans 5 miles each way, with aid stations stocked with drinks and snacks.

The race welcomes first-time ultrarunners, emphasizing a no-DNF policy and flexible distance changes during the event. Located near Atlanta suburbs, the race combines a supportive small-town atmosphere with proximity to local attractions. Proceeds benefit the homeless. Visit the organization's website for the most recent information.