The Next Loop Endurance Series - Lake Carl Blackwell

NOV
21
2026
Loop-based trail event at Lake Carl Blackwell where runners complete 3.1 mile loops and each finished loop counts toward official distance and ranking.
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 is a loop-based trail event held at Lake Carl Blackwell in Stillwater, OK, produced by EverFurther. The course is a clearly marked 3.1 mile loop that follows natural terrain and is measured as a 5K per lap.

The event format requires runners to begin each loop on the hour and complete as many laps as they choose. Each completed loop is recorded and counts toward a cumulative distance. Results are ranked by the number of loops completed and by the combined total time across laps. Loop times are recorded from the start of the hour to the moment a runner crosses the finish line. There are no cutoffs or penalties that negate completed laps.

An aid station is located at the central base area before each loop and provides hydration and basic nutrition. The centralized loop design makes it possible for crew, friends, and family to support runners between laps. The format allows athletes to vary pacing and recovery between hourly starts, and the loop-by-loop timing can be used for performance analysis.

Location details: Lake Carl Blackwell, 11000 W Hwy 51, Stillwater, OK 74074. The event is organized by EverFurther. 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 Loop Series

Events nearby

Trail races of 5K, 10K, half marathon and marathon take place at Lake McMurtry East Pavilion in Stillwater on October 17, 2026. The event is chip timed and includes a finisher medal and a post race celebration with refreshments.
Continuous loop ultra at Lake Carl Blackwell on a 3.1 mile trail loop with fully stocked aid each lap. Options for 40 or 50 miles, a 12 hour time limit, and designated crew and pacer access.
A loop based trail event at Lake Carl Blackwell on November 21, 2026 with 25K and 50K options and optional challenge stations that can reduce finish time. Tasks include strength, sandbag work, skill drills and mental focus exercises.
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