Silver Comet Half & Full Marathon 2026

The Silver Comet Half & Full Marathon takes place entirely on the Silver Comet Trail in Mableton, Georgia, located just outside Atlanta, on the final Saturday of October. The primary races are USATF-certified out-and-back courses, and a 10K is also included in the race series. The marathon is eligible as a Boston Qualifier, and the level, paved trail offers both new runners and those seeking personal bests a straightforward, quick path free from city traffic. The course crosses extended sections of paved path through forested areas in Atlanta’s northwestern suburbs. It utilizes the Silver Comet Trail in Cobb County, which is part of a former rail corridor beginning just inside the perimeter highway and extending west toward Alabama. Typically, over 1,500 runners participate, and the trail also attracts cyclists, families, and casual users on days other than the race. Silver Comet Races organizes the events; the organization was established by Dana Greene, and funds raised from the race benefit community initiatives and school running clubs.