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Cover photo of Mont-Blanc - TDS 2026 — 151 km, 9900 m elevation gain

Mont-Blanc - TDS 2026

August 24, 2026
Distance
151.2 km
Elevation gain
9900 m
Country
🇮🇹 Italy
Download the GPXOfficial race website
Course weather at your time of passage

The forecast arrives five days before the start.

Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 13 aid stations to plan your nutrition and hydration segment by segment.

What's your time based on your UTMB?

Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.

Predicted race time based on your UTMB Index® · smoothed times achieved by runners at your level in past editions

UTMB Index®608
Peaking30h14
Normal day
3005007009001000UTMB Index®
from Peaking (P10) to Survival mode (P90)extended based on 209,157 finishers from 222 racesCalibrated UTMB® points
SourceUTMB® IndexLiveTrail

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Cut-off times and crew - Mont-Blanc - TDS · 2026

151 km race checkpoints: kilometers, elevation, crew, cut-off time and access
Aid stationCum. kmCum. D+Seg. kmSeg. D+Seg. D-CrewCut-offAccess
Checrouit - Maison Vieille7.60 m7.6832 m95 mForbidden—
Lac Combal16.40 m8.8518 m498 mForbiddenTue 03:30 AM
La Thuile - Petit St Bernard36.50 m20.21,205 m992 mForbiddenTue 08:30 AM
Seez47.50 m11.021 m1,316 mForbidden—
Bourg St Maurice50.80 m3.428 m80 mAllowedTue 11:00 AM
Cormet de Roselend65.90 m15.11,921 m795 mForbiddenTue 05:15 PM
La Gittaz73.50 m7.6375 m701 mForbiddenTue 07:30 PM
Beaufort92.30 m18.81,018 m1,928 mAllowedWed 03:00 AM
Hauteluce98.80 m6.5575 m153 mForbiddenWed 05:30 AM
Le Signal115.60 m16.81,373 m685 mForbiddenWed 11:15 AM
Les Contamines123.40 m7.716 m753 mAllowedWed 01:15 PM
Chalets du Truc126.90 m3.6620 m40 mAllowed—
Les Houches142.00 m15.11,033 m1,738 mForbiddenWed 07:15 PM
Chamonix151.20 m9.2321 m287 m—Wed 08:45 PM

Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.

What you'll find at each aid station

Aid station contents: products in rows, aid stations in columns
ProductChecrouit - Maison Vieillekm 7.6Lac Combalkm 16.4La Thuile - Petit St Bernardkm 36.5Seezkm 47.5Bourg St Mauricekm 50.8Cormet de Roselendkm 65.9La Gittazkm 73.5Beaufortkm 92.3Hautelucekm 98.8Le Signalkm 115.6Les Contamineskm 123.4Les Houcheskm 142.0Chamonixkm 151.2
Wateravailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailable
Brand products · Näakunavailableavailableavailableunavailableavailableavailableavailableunavailableavailableavailableavailableavailableunavailable
Hot mealunavailableunavailableunavailableunavailableunavailableunavailableunavailableavailableunavailableunavailableunavailableunavailableavailable

Elevation profile

1000 M1500 M2000 M2500 MS01 · Checrouit - Maison Vieille KM 7.6 — Alt 1953 m D+ cumulé 0 m7.6 KMChecrouit - Maison Vi…S02 · Lac Combal KM 16.4 — Alt 1981 m D+ cumulé 0 m16.4 KMLac CombalS03 · La Thuile - Petit St Bernard KM 36.5 — Alt 2188 m D+ cumulé 0 m36.5 KMLa Thuile - Petit St…S04 · Seez KM 47.5 — Alt 888 m D+ cumulé 0 m47.5 KMSeezS05 · Bourg St Maurice KM 50.8 — Alt 836 m D+ cumulé 0 m50.8 KMBourg St MauriceS06 · Cormet de Roselend KM 65.9 — Alt 1966 m D+ cumulé 0 m65.9 KMCormet de RoselendS07 · La Gittaz KM 73.5 — Alt 1646 m D+ cumulé 0 m73.5 KMLa GittazS08 · Beaufort KM 92.3 — Alt 746 m D+ cumulé 0 m92.3 KMBeaufortS09 · Hauteluce KM 98.8 — Alt 1174 m D+ cumulé 0 m98.8 KMHauteluceS10 · Le Signal KM 115.6 — Alt 1869 m D+ cumulé 0 m115.6 KMLe SignalS11 · Les Contamines KM 123.3 — Alt 1136 m D+ cumulé 0 m123.3 KMLes ContaminesS12 · Chalets du Truc KM 126.9 — Alt 1719 m D+ cumulé 0 m126.9 KMChalets du TrucS13 · Les Houches KM 142.0 — Alt 1007 m D+ cumulé 0 m142.0 KMLes HouchesStart0 KMFinish151.2 KM

The course and its aid stations

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GPX
ravit.live

Mont-Blanc - TDS: times, aid-station stops and fuelling needs by UTMB® Index

Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 40h46 to 22h30, and the aid-station stop budget from 1h25 to 0h21. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.

SourceUTMB® Index
0h000h230h451h081h303005007009001000UTMB® Index
Estimated time, stop time and fuelling needs on Mont-Blanc - TDS by UTMB Index
UTMB® IndexEstimated timeOf which stopsNight hoursCarbsFluidSodiumCut-off margin
50040h461h2517.22,446 g28.5 L20,383 mg+4h09
55038h021h2017.22,282 g26.6 L19,017 mg+6h53
60034h361h0917.22,076 g24.2 L17,300 mg+10h19
65032h040h5417.21,924 g22.4 L16,033 mg+12h51
70027h300h4013.51,650 g19.3 L13,750 mg+17h25
75025h270h2811.51,527 g17.8 L12,725 mg+19h28
80022h300h218.51,350 g15.8 L11,250 mg+22h25

Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.

Measured on the 2026 edition: the field checkpoint by checkpoint

1,285 starters, 44.4% DNF rate, 23 timed checkpoints.

Duration of each segment on edition 2026: median and middle half of field
SegmentkmMedianMiddle halfMeasuredMedian passageStill ranked
Start → Checrouit7.71 h 191 h 10 – 1 h 261,2851 h 181,290
Checrouit → Mont-Favre12.21 h 0052 min – 1 h 081,2562 h 161,284
Mont-Favre → Lac Combal16.139 min33 min – 44 min1,2552 h 531,288
Lac Combal → Col des Chavannes20.61 h 121 h 00 – 1 h 211,0374 h 001,249
Col des Chavannes → Col du Petit-Saint-Bernard36.22 h 372 h 21 – 2 h 531,0316 h 471,248
Col du Petit-Saint-Bernard → Séez47.51 h 371 h 26 – 1 h 491,2178 h 201,222
Séez → Bourg-Saint-Maurice51.124 min21 min – 28 min1,2028 h 451,208
Bourg-Saint-Maurice → Fort de la Platte55.71 h 521 h 36 – 2 h 111,12711 h 051,131
Fort de la Platte → Passeur de Pralognan61.91 h 461 h 33 – 2 h 031,08212 h 491,095
Passeur de Pralognan → Cormet de Roselend66.159 min49 min – 1 h 091,08513 h 491,098
Cormet de Roselend → La Gittaz73.61 h 551 h 38 – 2 h 0999115 h 44995
La Gittaz → Entre2Nants76.71 h 091 h 00 – 1 h 2093516 h 53939
Entre2Nants → Outray841 h 521 h 40 – 2 h 0592618 h 44930
Outray → Beaufort92.31 h 461 h 30 – 2 h 1291120 h 28918
Beaufort → Hauteluce98.61 h 251 h 14 – 1 h 3677823 h 00778
Hauteluce → Barrage de la Girotte108.62 h 342 h 08 – 3 h 0075425 h 49756
Barrage de la Girotte → Signal E115.32 h 141 h 57 – 2 h 2865627 h 57750
Signal E → Signal S115.415 min7 min – 26 min63728 h 36750
Signal S → Les Contamines122.91 h 271 h 15 – 1 h 3973330 h 05738
Les Contamines → Col de Tricot130.12 h 552 h 35 – 3 h 1472133 h 07721
Col de Tricot → Bellevue136.81 h 571 h 41 – 2 h 0971735 h 07718
Bellevue → Les Houches141.458 min48 min – 1 h 0971636 h 05717
Les Houches → Chamonix150.51 h 301 h 20 – 1 h 4471537 h 31715

“Median passage” is elapsed time from the start, not a clock time: the clock time depends on the edition.

Where runners drop out. Beaufort (137) · Cormet de Roselend (103) · Bourg-Saint-Maurice (76) out of 570 total DNFs.

RAVIT record from the official timing of the 2026 edition, data from September 1, 2026.

SourceLiveTrail
See segment-by-segment analysis of Mont-Blanc - TDS

Other trails worth preparing for

Sources and method

  • Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
  • Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
  • Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — Mont-Blanc - TDS

Weather for Mont-Blanc - TDS

The weather for Mont-Blanc - TDS will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.

Detailed weather for Mont-Blanc - TDS, hour by hour on the course

Frequently asked questions

How many checkpoints?

Mont-Blanc - TDS has 14 checkpoints: 11 aid stations, 2 water points, and 1 checkpoint with undocumented contents. Details are in the two tables above.

What's the longest segment without aid?

The one leading to La Thuile - Petit St Bernard: 20.2 km and 0 m elevation gain. That's the one to load up for first.

How do I find the exact location of an aid station?

The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.

What distance and elevation gain?

Mont-Blanc - TDS is 151 km long with 9900 m of elevation gain.

How long to finish?

With a UTMB Index of 600 (average runner), the estimated time is around 34h36 for Mont-Blanc - TDS.

What's the weather forecast?

The weather for Mont-Blanc - TDS will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.

Want to stack the odds in your favor for Mont-Blanc - TDS?

In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.

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