Named by Terrain Magazine’s Readers as the Best Adventure Race in the area, the Castlewood 8-Hour Adventure Race© has grown to become the third-largest adventure race in the country. And it’s all happening right here in St. Louis.
What is Adventure Racing? A multi-sport, off-road, team event with no marked course. Teams must use a map and compass to navigate their way through a series of checkpoints on mountain bikes, in canoes, and or on foot to reach the Finish line.
How long is the race? Expect to cover 5-10 miles paddling, 15-20 miles biking, and 5-10 miles on foot. Please see the Frequently Asked Questions section for more information.
Race Location: That’s a secret! Part of the appeal of adventure racing is charging into the unknown on race day. A course overview will be available closer to race time to help you plan your gear and food. Plan on four to eight hours of continuous movement through the woods, rivers, and roads of the St. Louis area. (Even though the event is named after Castlewood State Park, we may not necessarily even go through the park on race day!)
Team Configurations:
Please Note: the cap for previous races was 300 participants and registrations were SOLD OUT before the end of October. Register early to ensure your spot in the race!
Dec 05, 2026
Distance — Ultra
Type — Running
65 days remaining
$300.00
Dec 05, 2026
Distance — Ultra
Type — Running
65 days remaining
$450.00
Dec 05, 2026
Distance — Ultra
Type — Running
65 days remaining
$600.00
Dec 05, 2026
Distance — Ultra
Type — Running
65 days remaining
$150.00
These values represent the 3-year monthly averages for December in St. Louis.
Learn more about the host city, St. Louis.
St. Louis is an independent city in the U.S. state of Missouri. It lies near the confluence of the Mississippi and the Missouri rivers. In 2020, the city proper had a population of 301,578, while its metropolitan area, which extends into Illinois, had an estimated population of over 2.8 million. It is the largest metropolitan area in Missouri and the second-largest in Illinois. The city's metropolitan statistical area is the 23rd-largest in the United States.
Read more launchTours and activities near St. Louis, powered by Viator.
Read what other athletes have to say about their experience at the Castlewood Adventure Race.
Be the first to share your experience with the community!
Spotted an error or missing detail about the Castlewood Adventure Race? Help us improve.
Explore other exciting events happening in this same region.
location_on St. Louis, Missouri, US
calendar_today Oct 25, 2026
location_on Webster Groves, Missouri, US
calendar_today Oct 10, 2026
Hand-picked events we think you’ll love.
Oct 01, 2026
DONNA 5K at TPC Sawgrass Saturday, October 10, 2026 | 8:30 AM Start PLAYERS Stadium Course at TPC Sawgrass The 19th Run…
Read more
Oct 01, 2026
Join REACH GREEN for our first fundraising event in Boston! REACH GREEN (reachgreen.org) is a Boston-based nonprofit fo…
Read more
Oct 01, 2026
On October 24, we celebrate where we began. Throughout October, we walk toward where we're going. Join Delta Zeta siste…
Read more
Oct 01, 2026
Hike the Appalachian Trail (virtually) with LiveWise! Traverse the 2,200 mile length of America's most famous footpath.…
Read more
