Courmayeur, Italy · Trail
Official site ↗TDS
Sur les Traces des Ducs de Savoie: about 145 km from Courmayeur to Chamonix on the wildest, most technical course of UTMB week, started near midnight.
Completed August 24, 2026
women
- 1. Sarah Vieuille22:08:16
- 2. Alice Meignié22:30:29
- 3. Alyssa Clark22:54:19
men
- 1. Rémy Brassac19:28:43
- 2. Pierre-Adrien Hivert20:14:26
- 3. Nicolas Court20:56:52
Distances
- Distance
- 145 km (90 mi)
- Vert gain
- 9,500 m (31,200 ft)
- Cutoff
- 44 hr 55 min
Starts Monday 23:50 from Courmayeur · WSER 2027 qualifier (sub-44:10)
| Distance | Vert gain | Cutoff | Notes |
|---|---|---|---|
| 145 km (90 mi) | 9,500 m (31,200 ft) | 44 hr 55 min | Starts Monday 23:50 from Courmayeur · WSER 2027 qualifier (sub-44:10) |
About
The TDS leaves Courmayeur late on Monday night of UTMB week and takes the long, rough way to Chamonix: about 145 kilometers with 9,500 meters of climbing over the Savoy side of the massif, through Bourg-Saint-Maurice and the Beaufortain. It is the technical race of the week, with exposed ridgelines and steep, wild descents the UTMB course itself avoids.
The night start sends every runner through at least one full night, and the course's reputation for difficulty means a slower, more selective field than its distance suggests.
Course
Courmayeur to Chamonix the hard way: over the Petit Saint-Bernard toward Bourg-Saint-Maurice, through the Beaufortain's steep grass and rock, and back north over the Col de Tricot to Chamonix. About 145 km with 9,500 m of climbing, most of it technical.
How to register
TDS registers separately from the UTMB, CCC and OCC lottery and sells until it is full: the 2026 entry page lists those three as a closed lottery and TDS simply as sold out. Entry needs a valid UTMB Index in the 100K or 100M category, and elite places go by index.