40/50 Mile Challenge - Cliff Cave

AUG
22
2026
Continuous 40 or 50 mile loop racing on a 3.1 mile trail at Cliff Cave Park with a fully stocked aid station each lap and a 12 hour cutoff. The course features wooded hillsides, limestone bluffs and Mississippi River overlooks.
Sat 22 Aug 2026
50 miles 40 miles 3 miles

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40/50 Mile Challenge - Cliff Cave

The 40/50 Mile Challenge is a continuous loop trail race held at Cliff Cave Park, using a clearly marked 3.1 mile (5K) loop on the River Bluff Trail. The course runs through wooded hillsides and limestone bluffs and includes overlooks of the Mississippi River.

Trail surface is mainly packed dirt with sections of crushed limestone and natural singletrack. The route contains roots, short climbs, rolling hills, and a few technical areas on bluff-side sections. Runners return to the same central start and finish area each lap where a fully stocked aid station is available.

Runners may access personal supplies from a designated staging area each loop. Crew access is permitted in designated areas and pacers are allowed subject to location specific and time based rules. Medical and race staff are on site throughout the event. The event runs simultaneously with The Next Loop Endurance Series on the same course; Next Loop participants run on the hour while 40/50 Mile Challenge competitors run continuously and are scored separately.

Event format details include a 12 hour time limit and continuous loop racing on a 3.1 mile trail. Location is Cliff Cave Park, 806 Cliff Cave Rd, St Louis, MO, 63129.

Distances Offered: Visit the organization's website for the most recent information.

  • 40 Mile
  • 50 Mile
50 mi
50 Mile
40 mi
40 Mile
3 mi
Loop Length
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