Courmayeur, Italy September 13, 2026
A 330 km non-stop loop of the Aosta Valley with 24,000 m of climbing and almost no sleep. The Endurance Trail is one of the hardest things a runner can attempt.
Trail 165 km · 9,600 m+
The Madmen's Diagonal crosses the volcanic island of Reunion from coast to coast through jungle and cirques. Steep, wild and gloriously punishing.
Trail 161 km · 10,000 m+
A savage high-altitude loop through the San Juan Mountains of Colorado, finishing by kissing the Hardrock. One of the toughest and most coveted 100-milers on Earth.
Trail 161 km · 4,800 m+
The Race Across the Sky, run entirely above 2,800 m in the Colorado Rockies. Thin air, Hope Pass and a finish where the whole town stays up to cheer.