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The Next Loop Endurance Series | Cliff Cave Park

📅 August 21, 2027 (estimated date)📍 St. Louis · United States

⚠️ 2027 edition: provisional information

The date is estimated from the 2026 edition (August 22, 2026), on the same day of the week. Courses, start times, fees and description are carried over from the previous edition: check them on the official website. This page will be updated as soon as the organizer publishes them.

Available distances

31.1 mi26.2 mi13.1 mi6.2 mi3.1 mi

About

The Next Loop Endurance Series | Cliff Cave Park is a loop-format trail race at Cliff Cave Park in St. Louis on August 21, 2027, with 50K (31.1 miles), marathon (26.2 miles), half marathon (13.1 miles), 10K and 5K options, all starting at 7:00 a.m. Open to runners of all levels, it sends participants out on a 3.1-mile trail loop, with a new loop starting every hour.

Results are based solely on the number of loops completed, putting the emphasis on consistency and endurance. The event offers a clearly marked course, aid stations and an encouraging atmosphere, and suits beginners and experienced athletes who want to test their pacing and recovery. Official timing records every loop, making it possible to analyze the data and compare performances.

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