Races
TDS (Sur les Traces des Ducs de Savoie)
Courmayeur at midnight. Sur les Traces des Ducs de Savoie. Nine thousand meters of climbing in 147 km. The Beaufortain decides who finishes.
147 km+31,017 ft-31,632 ft44:10 hours2,365 ft to 8,494 fttech 9/10Checkpoints per race bookpoint-to-pointUTMB weekBeaufortainWSER qualifierAugustRunning Stones · 6 stonesHardrock qualifier
Distance147 km
Gain+31,017 ft
Loss-31,632 ft
Altitude2,365 ft to 8,494 ft
Technicality9/10
Air32°F to 75°F
- Start4,011 ft
- High8,219 ft
- Low2,385 ft
- Finish3,396 ft
- Cormet de Roselend at mile 9.3, cutoff 3 hours
- La Gitte at mile 16
- Col du Petit-Saint-Bernard at mile 23, cutoff 8 hours, drop bag
- Bourg-Saint-Maurice at mile 26, cutoff 9 hours, crew
- Passeur de Pralognan at mile 32
- Cormet de Roselend II at mile 37, cutoff 15.5 hours
- Col du Bonhomme at mile 41
- Refuge des Mottets at mile 47, cutoff 20 hours, drop bag
- Col de la Seigne at mile 51
- Lac Combal at mile 55, cutoff 23 hours
- Courmayeur at mile 64, cutoff 27.5 hours, crew, drop bag
- Refuge Bertone at mile 68
- Refuge Bonatti at mile 73, cutoff 30.5 hours
- Arnouvaz at mile 76
- Grand Col Ferret at mile 79
- Finish La Fouly at mile 90, cutoff 34 hours, crew
Terrain
Field, 2026 · 16-year samplescraped
Starters1290
Finish rate55%
Median37:30
Sub-2421
Geometryderived
Steepest drop3,953 ft-23.3% over 3.2 mi
Night miles27 misunset near 19:00 local
Weather at the cruxderived
At hour 6 of race, feels like 34 C (91 F).Sample of 7 race days, medium confidence.At hour 6 of race, apparent temperature P90 is 34 C / 92 F.
Mandatory kit14 required verified
- Water container 1.5 L minimumhydration
- Long trail-running pants or leggingsclothing
- Warm hat and glovesclothing
- Warm second layer, long sleevesclothing
- Waterproof over-trousersclothing
- Windproof jacket with hood, taped seamsclothing
Course records
Men13:24:00Marcin SWIERC
Women15:47:07Mimmi KOTKA
The cruxPasseur de Pralognan (2,552 m) and Col Chavannes (2,580 m)
Course DNA
The Course
Italy to France through the Aosta Valley, Tarentaise, and Beaufortain. Starts in Courmayeur on Monday night. Lac Combal and Petit Saint-Bernard come fast. Bourg Saint-Maurice sits low at km 50. Cormet de Roselend and the long grind into Beaufort at km 92, the only drop-bag before Chamonix. Col Chavannes at 2,580 meters crosses in the dark above the Vallee des Glaciers. Passeur de Pralognan is the technical crux: steep, exposed, often bottlenecked on fixed lines.
The Work
Nearly UTMB vert in a shorter course. Sixty-five meters of gain per kilometer. Train steep sustained climbs and long descents on tired legs. Eccentric quad work after back-to-back cols. Night hiking with poles on technical terrain.
Kit
Full UTMB mandatory kit. Windproof layer for cols above 2,400 meters. Headlamp with spare batteries for two nights minimum. Soft flask capacity for long sections between Bourg Saint-Maurice and Beaufort. Poles are not optional on the Passeur.
Race Day
Do not treat the opening valley miles as free speed. Save the legs for Cormet de Roselend and the Beaufort approach. Beaufort at km 92 is the crew hub. Dry socks. Hot food. The Passeur hits when sleep debt is real. Stay patient in queues.
Results
TDS (Sur les Traces des Ducs de Savoie) finish lines.
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Sources (7)
- Field stats (2026): https://utmb.world/utmb-index/races/646.hokautmbmont-blanctds.2026?page=1
- TDS 2026 runner manual, aid stations table: https://utmbmontblanc.com/en/page/376/tds.html
- Mandatory gear: https://utmbmontblanc.com/en/page/349/mandatory-equipment.html
- Qualifier: utmb_stones: https://utmb.world/utmb-world-series
- Qualifier: hardrock_qualifier: https://hardrock100.com/qualifying/
- Course record (M): https://utmb.world/utmb-index/races/646.hokautmbmont-blanctds.2018?page=1
- Course record (F): https://utmb.world/utmb-index/races/646.hokautmbmont-blanctds.2017?page=1