Embark on a challenging and unforgettable trail adventure at the Mystery Mountain Marathon & 12-Miler on October 18, 2026, held within the stunning landscapes of Fort Mountain State Park in Chatsworth, GA. This race, renowned for its difficulty and breathtaking beauty, offers both a full marathon and a 12-mile option, traversing a dynamic mix of single-track, rugged mountain bike trails, and smoother horse trails. Runners can expect rocky and rooty sections, long extended climbs, and descents, with the marathon route boasting approximately 5,500 feet of elevation gain. The course winds around Fort Mountain, treating participants to panoramic views of vibrant fall foliage and a unique encounter with the mysterious, ancient rock wall built atop the mountain over a thousand years ago.

Both distances kick off with a scenic loop around the lake, leading into key trails like Big Rock and the Gahuti. Marathoners will further tackle the challenging 301 loop, featuring diverse forest scenery, old mines, and picturesque waterfalls. Aid stations are well-supported, with the 12-miler offering three full and one fluids-only station, while marathoners will find six full and two fluids-only stations. Runners consistently praise the event's organization by the volunteer non-profit GUTS, which dedicates a portion of its proceeds to Fort Mountain State Park, and the encouraging atmosphere provided by its volunteers. Typical race day conditions in mid-October present comfortable highs around 73°F and lows near 48°F, with a modest 16% chance of precipitation, creating ideal cool-weather running.

This truly unique event is celebrated by runners as "addictive," "gorgeous," and a "true trail race" that demands full engagement with its climbs, water crossings, and varied terrain. Be prepared for a formidable yet rewarding experience that delivers "a beating unlike many other races," all while being enveloped in the serene beauty of the North Georgia mountains. Combined race entries are limited to 250 participants, ensuring an intimate and focused trail running experience.