Bison Ultra-Trail 2026

Bison Ultra Trail is a trail-running series held in Supraśl, offering six race distances from a 12 km run up to the BISON ULTRA-TRAIL® 100. The series also features 18 km, 30 km, 50 km, and 70 km races, allowing participants to select a shorter forest run or a full 100 km ultra. Fundacja Białystok Biega organizes the event, with B4SPORT managing timing and results. The event draws a substantial field for a trail race, with over 2,200 registrations and more than 1,800 starters across all distances.