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Cover photo of Mont-Blanc - UTMB 2026 — 177 km, 9945 m elevation gain

Mont-Blanc - UTMB® 2026

August 28, 2026
Distance
177.3 km
Elevation gain
9945 m
Country
🇫🇷 France

This page is generated independently by RAVIT. RAVIT is not affiliated with UTMB Group SAS, the race's official organizer.

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 15 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®644
Peaking29h34
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 - UTMB® · 2026

177 km race checkpoints: kilometers, elevation, crew, cut-off time and access
Aid stationCum. kmCum. D+Seg. kmSeg. D+Seg. D-CrewCut-offAccess
Les Houches9.10 m9.1220 m246 mForbidden—
Saint-Gervais22.90 m13.8821 m1,021 mForbiddenSat 12:00 AM
Les Contamines32.60 m9.7498 m159 mAllowedSat 02:00 AM
La Balme41.20 m8.6583 m34 mForbiddenSat 04:00 AM
Les Chapieux52.30 m11.1791 m952 mForbiddenSat 07:15 AM
Col de la Seigne63.10 m10.81,053 m89 mForbidden—
Lac Combal69.60 m6.4274 m812 mForbiddenSat 12:00 PM
Checrouit - Maison Vieille78.60 m9.0481 m489 mForbidden—
Courmayeur Forum Sport Center83.40 m4.97 m769 mAllowedSat 03:15 PM
Refuge Bertone88.90 m5.4800 m16 mForbidden—
Arnouvaz101.80 m13.0421 m633 mForbiddenSat 08:15 PM
Grand Col Ferret106.40 m4.5762 m0 mForbidden—
La Fouly116.30 m10.070 m996 mForbiddenSun 12:30 AM
Champex-Lac130.20 m13.8513 m638 mAllowedSun 04:30 AM
Trient146.80 m16.6862 m1,035 mForbiddenSun 10:00 AM
Vallorcine158.90 m12.2801 m851 mAllowedSun 01:15 PM
La Flégère170.40 m11.4951 m339 mForbiddenSun 04:45 PM
Chamonix177.30 m7.013 m852 m—Sun 06:30 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
ProductLes Houcheskm 9.1Saint-Gervaiskm 22.9Les Contamineskm 32.6Les Chapieuxkm 52.3Lac Combalkm 69.6Checrouit - Maison Vieillekm 78.6Courmayeur Forum Sport Centerkm 83.4Refuge Bertonekm 88.9Arnouvazkm 101.8La Foulykm 116.3Champex-Lackm 130.2Trientkm 146.8Vallorcinekm 158.9La Flégèrekm 170.4Chamonixkm 177.3
Wateravailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailableavailable
Brand products · Näakunavailableavailableavailableunavailableavailableunavailableunavailableunavailableavailableavailableunavailableavailableavailableunavailableunavailable
Hot mealunavailableunavailableunavailableavailableunavailableunavailableavailableunavailableunavailableunavailableavailableunavailableunavailableunavailableavailable

Elevation profile

1000 M1500 M2000 M2500 MS01 · Les Houches KM 9.1 — Alt 1009 m D+ cumulé 0 m9.1 KMLes HouchesS02 · Saint-Gervais KM 22.9 — Alt 809 m D+ cumulé 0 m22.9 KMSaint-GervaisS03 · Les Contamines KM 32.6 — Alt 1148 m D+ cumulé 0 m32.6 KMLes ContaminesS04 · La Balme KM 41.2 — Alt 1704 m D+ cumulé 0 m41.2 KMLa BalmeS05 · Les Chapieux KM 52.3 — Alt 1546 m D+ cumulé 0 m52.3 KMLes ChapieuxS06 · Col de la Seigne KM 63.1 — Alt 2512 m D+ cumulé 0 m63.1 KMCol de la SeigneS07 · Lac Combal KM 69.5 — Alt 1973 m D+ cumulé 0 m69.5 KMLac CombalS08 · Checrouit - Maison Vieille KM 78.5 — Alt 1961 m D+ cumulé 0 m78.5 KMChecrouit - Maison Vi…S09 · Courmayeur Forum Sport Center KM 83.4 — Alt 1194 m D+ cumulé 0 m83.4 KMCourmayeur Forum Spor…S10 · Refuge Bertone KM 88.9 — Alt 1977 m D+ cumulé 0 m88.9 KMRefuge BertoneS11 · Arnouvaz KM 101.8 — Alt 1768 m D+ cumulé 0 m101.8 KMArnouvazS12 · Grand Col Ferret KM 106.4 — Alt 2532 m D+ cumulé 0 m106.4 KMGrand Col FerretS13 · La Fouly KM 116.3 — Alt 1602 m D+ cumulé 0 m116.3 KMLa FoulyS14 · Champex-Lac KM 130.2 — Alt 1475 m D+ cumulé 0 m130.2 KMChampex-LacS15 · Trient KM 146.8 — Alt 1303 m D+ cumulé 0 m146.8 KMTrientS16 · Vallorcine KM 158.9 — Alt 1260 m D+ cumulé 0 m158.9 KMVallorcineS17 · La Flégère KM 170.4 — Alt 1875 m D+ cumulé 0 m170.4 KMLa FlégèreStart0 KMFinish177.3 KM

The course and its aid stations

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GPX
ravit.live

Mont-Blanc - UTMB®: 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 43h01 to 24h36, and the aid-station stop budget from 2h15 to 0h33. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.

SourceUTMB® Index

Below a UTMB® Index of roughly 355, the overall cut-off of 46h45 is no longer reachable at the estimated pace.

0h000h351h091h442h183005007009001000UTMB® Index
Estimated time, stop time and fuelling needs on Mont-Blanc - UTMB® by UTMB Index
UTMB® IndexEstimated timeOf which stopsNight hoursCarbsFluidSodiumCut-off margin
50043h012h15202,581 g30.1 L21,508 mg+3h44
55040h132h09202,413 g28.2 L20,108 mg+6h32
60037h101h54202,230 g26 L18,583 mg+9h35
65033h181h2818.11,998 g23.3 L16,650 mg+13h27
70029h481h0514.61,788 g20.9 L14,900 mg+16h57
75027h450h4612.51,665 g19.4 L13,875 mg+19h00
80024h360h33101,476 g17.2 L12,300 mg+22h09

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

2,406 starters, 30.1% DNF rate, 23 timed checkpoints.

Duration of each segment on edition 2026: median and middle half of field
SegmentkmMedianMiddle halfMeasuredMedian passageStill ranked
Start → Col de Voza14.52 h 041 h 48 – 2 h 182,3912 h 022,400
Col de Voza → Saint-Gervais22.91 h 0354 min – 1 h 092,3913 h 032,401
Saint-Gervais → Les Contamines32.41 h 311 h 16 – 1 h 412,3804 h 332,381
Les Contamines → La Balme41.11 h 411 h 26 – 1 h 542,3186 h 122,321
La Balme → Croix du Bonhomme46.91 h 411 h 24 – 1 h 542,2627 h 542,316
Croix du Bonhomme → Les Chapieux52.244 min36 min – 51 min2,2628 h 342,314
Les Chapieux → Col de la Seigne62.92 h 302 h 07 – 2 h 482,25011 h 022,256
Col de la Seigne → Lac Combal69.839 min34 min – 46 min2,24611 h 402,253
Lac Combal → Mont-Favre73.81 h 1059 min – 1 h 222,20012 h 492,205
Mont-Favre → Checrouit78.342 min35 min – 49 min2,19713 h 342,205
Checrouit → Courmayeur83.248 min39 min – 57 min2,17814 h 232,183
Courmayeur → Refuge Bertone88.61 h 251 h 14 – 1 h 372,05716 h 262,058
Refuge Bertone → Refuge Bonatti96.11 h 301 h 13 – 1 h 452,04917 h 582,049
Refuge Bonatti → Arnouvaz101.41 h 0150 min – 1 h 082,02419 h 002,024
Arnouvaz → Grand Col Ferret1061 h 421 h 26 – 1 h 541,90320 h 451,903
Grand Col Ferret → La Fouly115.91 h 431 h 24 – 2 h 001,88822 h 251,888
La Fouly → Champex-Lac130.12 h 392 h 12 – 3 h 121,80625 h 021,806
Champex-Lac → La Giète141.62 h 552 h 24 – 3 h 241,72828 h 421,737
La Giète → Trient146.61 h 0649 min – 1 h 161,72229 h 521,731
Trient → Les Tseppes150.61 h 361 h 18 – 1 h 501,70531 h 361,708
Les Tseppes → Vallorcine157.91 h 361 h 22 – 1 h 471,69733 h 261,704
Vallorcine → La Flégère169.23 h 042 h 41 – 3 h 221,68836 h 551,689
La Flégère → Chamonix176.21 h 151 h 02 – 1 h 331,68038 h 111,681

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

Where runners drop out. Courmayeur (129) · Arnouvaz (121) · La Fouly (82) out of 725 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 - UTMB®

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 - UTMB®

Weather for Mont-Blanc - UTMB®

The weather for Mont-Blanc - UTMB® 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 - UTMB®, hour by hour on the course

Frequently asked questions

How many checkpoints?

Mont-Blanc - UTMB® has 18 checkpoints: 11 aid stations, 4 water points, and 3 checkpoints with undocumented contents. Details are in the two tables above.

What's the longest segment without aid?

The one leading to Les Chapieux: 19.8 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 - UTMB® is 177 km long with 9945 m of elevation gain.

How long to finish?

With a UTMB® Index of 600 (average runner), the estimated time is around 37h10 for Mont-Blanc - UTMB®.

What's the weather forecast?

The weather for Mont-Blanc - UTMB® 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 - UTMB®?

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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