Arrowhead 135

The Arrowhead 135 is a grueling 135-mile human-powered ultra-endurance race held in Northern Minnesota, running from International Falls to Tower along the rugged Arrowhead State Snowmobile Trail. Participants can choose to compete by foot, ski, or bicycle in one of the coldest winter environments in the contiguous United States, with temperatures often plunging to -30 to -40°F and frequent snowstorms. Known as one of the world's toughest endurance challenges, the race attracts elite winter ultra-athletes and has a challenging finish rate near 50%. The event emphasizes solitude on the trail, volunteer support, and charitable contributions to military families and local communities. Visit the organization's website for the most recent information.