Flatrock

OCT
17
2026
Trail races at Harbins Park near Dacula, Georgia, including a half marathon, a 50K, and a 50/50 challenge that requires completing 50 miles within the 50k cutoff. The course is nontechnical with short hills and accessible aid stations.
Sat 17 Oct 2026
50 miles 50 kilometers 13 miles

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Flatrock - Dacula, Georgia

Flatrock is a trail running event held in Harbins Park near Dacula, Georgia. The event offers multiple distances and a special 50/50 challenge. Registration is capped and organizers have noted past sellouts; registration closes Sat, Oct 10 at 11:59 PM ET.

Distances:

  • 50/50 Challenge (attempt to extend to 50 miles after the 50k)
  • 50K
  • Half Marathon (one loop)

The course follows undulating, nontechnical single-track trails through wooded terrain. Hills are short and generally take a minute or two to climb. The 50k route uses two 13.2-mile loops and one 5.2-mile loop; the half consists of a single loop. Aid stations are located on the course and are accessible to friends and family.

Cutoffs listed by organizers:

  • 50k 9 hours
  • 13.2 5 hours
  • 50/50 9 hours strict cutoff

The 50/50 challenge allows a runner to continue for an additional 20 miles after completing the 50k, but the full 50 miles must be completed within the 50k 9 hour cutoff to receive credit. Participants who finish the 50/50 receive a completion shirt and a free entry to the following year. Race entrants receive a commemorative race item and complimentary race photos. Refund, transfer, and race credit policies are specified by the organizers. Visit the organization's website for the most recent information.

50 mi
50/50 Challenge
50 km
50k
13 mi
13.2
13 mi
1/2 Marathon
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