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MISSOURI
MammothMarch Missouri 2026
We are excited to have once again secured the remote Weldon Spring Conservation Area and its excessive trail system for our 2026 MammothMarch Missouri edition. Hike 20 miles along a great mixture of diverse trails, such as Katy Trail and Lewis & Clark Trail featuring superb overlooks of the Missouri River.
Our single-circuit hiking loop starts and finishes at the beautiful Defiance Ridge Vineyards, located just half an hour west of downtown St. Louis.
Master the challenge and spend a beautiful day hiking 20 miles at a stretch. Getting your finisher medal, you will be exhausted but proud and happy... as well as part of our amazing community of nature-lovers, hikers and MammothMarch addicts!
At a glance
Date: Sunday, September 13, 2026
Location (start/finish): Defiance Ridge Vineyards, 2711 South Highway 94, Defiance, MO 63341
Distance: 20 miles in 8 hours
There is no timekeeping, there are no failures, we only recognize the incredible courage it takes to rise to our challenge. Every participant completing the distance will be awarded their finisher medal and considered a winner!
Starting time: You can choose from several time slots as early as 7:00 a.m. with limited capacity when signing up. This ensures the most remote hiking experience as a maximum of 5 hikers will cross the starting line at the same time. The first ones will head out between 7:00 a.m. – 7:15 a.m. with the majority coming back in just about 8 hours. With the majority coming back in just about 8 hours, we will have our finish line open for the ones that need a bit more time. There will be a cut-off time at either aid station – safety first!.
Parking: Complimentary parking will be available on site.
Aid/refreshment stations: There are water stops and aid stations along the route (approximately positioned every 5-7 miles apart) providing toilets, food, and drinks for all participants. These refreshments are included in the cost of your ticket and vary between each station, offering water, energy drinks, electrolytes, fruits, cereal/protein bars, PBJ sandwiches and more.
Certificates: All finishers will receive their personalized certificate after crossing the finish line. For the ones who drop out, we will issue certificates stating the mileage covered.
Finisher medal/wall of fame: For all participants finishing MammothMarch.
Hiking Pass: MammothMarch Hiking Passes will be made available for all new participants. All participants from previous editions or different MammothMarch events should bring their Hiking Pass to collect their 2026 stamps on site.
Merchandise: Check out our Missouri event store on Raceroster right here. Items ordered will be ready for pick up on event day.
You can also visit our official MammothMarch online shop right here. Please note: The difference between the Raceroster event store and our official online store is that we will ship your items ordered in our official online store while products added during your registration or later through Raceroster will be ready for pick up on event day.
Route: The single-circuit loop leads through Weldon Springs Conservation Area, along various trails, such as Hamburg Trail, Lewis & Clark Trail, Katy Trail. Check out our 2025 route for reference right here.
Total elevation gain: Around 1,100 ft.
Terrain: A great mixture of paved and unpaved hiking trails, dirt trails, gravel roads, forest floor.
What are you waiting for? Sign up here to enter “not your average hike”.
Please check out more details in our FAQ section or contact us contact@mammothmarch.com.