The Next Loop Endurance Series - Lake Carl Blackwell

NOV
21
2026
Experience a flexible trail event at Lake Carl Blackwell where you complete 5K loops every hour and decide your own distance one lap at a time.
Sat 21 Nov 2026
50 kilometers Marathon Half Marathon 10 kilometers 5 kilometers

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The Next Loop Endurance Series at Lake Carl Blackwell

The Next Loop Endurance Series offers a flexible trail running experience at Lake Carl Blackwell Park in Stillwater, Oklahoma. This event utilizes a loop-based format that allows participants to decide their total distance as they progress through the day. The course consists of a scenic 3.1-mile (5K) trail loop through natural terrain.

The event follows a specific hourly structure where a new loop begins at the top of every hour. Runners complete the 5K circuit, then use the remaining time in the hour to rest and refuel at the central base area before deciding whether to start the next lap. Every finished loop contributes to the participant's total distance, with milestones recorded for various achievements:

  • 5K (1 loop)
  • 10K (2 loops)
  • Half Marathon (4 loops)
  • Marathon (9 loops)
  • 50K (10 loops)

The timing system records individual loop times and total combined time. There are no traditional cutoffs or penalties; participants can choose to stop at any point, and all completed laps are included in the final official results. A central aid station provides hydration and nutrition at the base area, which also serves as a convenient location for friends and family to support runners between laps. Organized by EverFurther, the event focuses on personal progression in a trail setting. Visit the organization's website for the most recent information.

50 km
10 Loops (50k)
Marathon
9 Loops (marathon)
Half Marathon
4 Loops (half Marathon)
10 km
2 Loops (10k)
5 km
1 Loop (5k)
10 Hour Endurance
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