Double Chubb 50K
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Event details
The Double Chubb trail races take place on March 28, 2026 at West Tyson County Park, 131 N. Outer Rd East, Eureka, Missouri. Distances offered:
- 50K
- 25K
- 25K RUCK
- 8M
The new 25K RUCK requires participants to carry a minimum of 20 pounds (not including food and water) for the entire course. Packs will be weighed at the start. All ruck finishers receive a finisher's medal.
Logistics and rules
Packet pickup is Friday, March 27 at the Des Peres Fleet Feet location from 4:00 pm to 6:30 pm; race day pickup begins at 7:00 am at the park entrance. Registration closes Thu, Mar 26 at 10:00 pm CT. There are no refunds. A runner may drop from the 50K to the 25K up to one week prior; later drops are allowed but are not eligible for overall or age group awards. There is no waitlist.
Race cutoff is about nine hours for all races; the 50K first loop cutoff is about four hours. Aid stations are cup free and will provide water, electrolytes, and standard ultra foods. Aid stations are located at approximately 3.5M, 8M, 12.5M, 16M, 19.5M, 24M and 28.5M. Drop bags should be labeled and will be moved to the finish/halfway area; unclaimed items will be donated. Bib transfers are permitted until 4/10/2025. The event is organized by the Saint Louis Ultrarunners Group. Visit the organization's website for the most recent information.