To enter our wait list please click here and we will notify you in case additional tickets become available (first come, first served) and keep you posted on future editions. 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!

Signing up for the first time? Take a look at past events and what our participants say: https://www.mammothmarch.com/reviews