Double Chubb 50K
St. Louis, United States • 28 Mar 2026
Overview
The Double Chubb event offers trail races and a rucking challenge on March 28, 2026. The races take place at West Tyson County Park in Eureka, Missouri. Registration is handled through UltraSignup.
Distances
The event includes several distances:
- 50K trail run
- 25K trail run
- 25K RUCK challenge
- 8M trail run
For the new 25K RUCK event, participants must carry a minimum of 20 pounds (excluding food and water) for the entire race. All packs will be weighed at the start.
Logistics
Packet pickup is available on Friday, March 27, 2026, at the Des Peres Fleet Feet location, and on race day starting at 7:00 AM at the park entrance. The start area is near the entry gate to West Tyson County Park.
The course features multiple aid stations located approximately at 3.5M, 8M, 12.5M, 16M, 19.5M, 24M, and 28.5M. The event is a cup-free race, so participants must bring their own water bottle or hydration pack. Aid stations provide standard ultra food like bananas, pretzels, potatoes, chips, water, and electrolytes.
A drop bag area will be available near the start line. Bags will be moved to the finish line, which is also the halfway point for the 50K. All unclaimed items will be donated to charity.
Policies
There is a cutoff time of approximately nine hours for all races. For 50K runners, there is an intermediate cutoff of approximately four hours for the first loop. Participants may drop from the 50K to the 25K up to one week prior to race day. Bib transfers are allowed until April 10, 2025, via a specific process on the UltraSignup website. There are no refunds, deferrals, or waitlists. The event is organized by the Saint Louis Ultrarunners Group (SLUG), whose members receive a $10 discount on registration. Visit the organization's website for the most recent information.