Mystery Mountain Marathon & 12-Miler

OCT
18
2026
Tackle the technical trails of Fort Mountain State Park in this 17th annual trail running weekend. Choose between a marathon with 5,500 feet of climbing or a 12-mile race, both featuring scenic fall foliage and a mysterious ancient wall. Finish with a relaxed lakeside celebration.
Sun 18 Oct 2026
26 miles 12 miles

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Event Overview

The Mystery Mountain Marathon & 12-Miler is a trail running event held at Fort Mountain State Park in Chatsworth, Georgia. The 17th annual event offers a marathon and a 12 Miler distance.

Course Details

Both courses traverse trails over and around Fort Mountain. The trails are described as difficult and sometimes technical. The marathon has an elevation gain of approximately 5,500 feet. Runners will encounter single-track, rugged mountain bike, and smooth horse trails. A point of interest on the course is a mysterious rock wall built at the top of the mountain over 1,000 years ago.

Race Weekend

A post-race celebration is described as fun and low-key, located by a lake.

Time Limits

The 12 Miler has a 6-hour time limit. The marathon has an 8-hour time limit. Both distances share an intermediate cutoff at the park entrance (approximately 8 miles) at 3.5 hours. The marathon has additional cutoffs at the Power Line Aid Station (11 miles), Far Out Aid Station (18.9 miles), and Last Gasp (22.3 miles).

Awards

Awards are given for top three overall women and men. First place masters and grandmasters women and men are also recognized. Visit the organization's website for the most recent information.

26 mi
Marathon
12 mi
12-Miler