Doomsday 5k - Oakville, MO
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Event overview
The Doomsday 5K is a trail race taking place on January 1, 2026, at Cliff Cave County Park, 806 Cliff Cave Rd, Saint Louis, MO 63129. The race is presented by Terrain Trail Runners and is open to male, female, and non-binary runners. Registration closes on December 28, 2025. Race day registration will be accepted on site for a fee of $70, cash only; onsite registrants receive a custom pint and may swap it for a shirt if sizes remain.
Course, logistics, and awards
The race distance is 5K with approximately 272 feet of elevation gain. The course begins a short distance past the train tracks, includes about 0.5 mile of pavement, then follows the Spring Valley Trail Outer Loop for about 1.8 miles, and returns on pavement for the final 0.5 mile. Spring Valley Trail is an all-dirt trail with rolling hills, roots, and rocks. All finishers receive a custom medal. Awards for top performers in male, female, and non-binary categories are a $50 credit toward a 2026 Terrain Trail Runners event. The event is cup-free; runners and volunteers should bring their own mug and mess kit for post-race coffee and snacks. The organizers note a sustainability pledge and reduced-waste practices. Visit the organization's website for the most recent information.
