Test your limits in the St. Croix 40 Winter Ultra, a demanding winter survival event set in the breathtaking St. Croix State Park. Participants will cover approximately 40 miles on foot, ski, or fat bike, navigating through a frigid night while carrying essential survival gear. This race not only challenges your endurance but also your survival skills. Contestants start wrapped in bivy sacks and sleeping bags, showcasing their setup abilities, and at the sole aid station, they must boil water using their stove. It's an opportunity to hone skills for future ultra challenges while experiencing a unique and thrilling adventure.