UTMB Mont-Blanc, segment by segment

Your rank over 23 segments, vs runners at your level — 2,406 starters measured on the 2026 edition.

UTMB Mont-Blanc, 176 km — the course whose 23 segments this page analyzes

Where did you stand?

Your bib or name is enough. Free, no account, no payment.

Free, no account. Your bib only helps us find your times, nothing else.

How to read this page

“Ahead of 62% of runners”: On this segment, 62 runners out of 100 at your level took longer than you. Statisticians call this the 62nd percentile; same thing. 100 = fastest, 0 = slowest.
“Your level”: The 60 runners whose UTMB Index is closest to yours, in the same edition. Not the winner, not the field average: people who run like you do. The index ranges from around 300 to 1,000.
“The median”: The time that splits the field in half: half did better, half did worse. On Refuge Bertone, it's 1 h 25. Sturdier than an average, which a single very slow runner is enough to shift.
“The central half”: The shaded zone on the graph: between the fastest quarter and the slowest quarter. Half your group sits there. Staying in it from start to finish means you held your rank.
“The trend”: The solid line. Your rank bounces around segment to segment—a bathroom stop moves it. The trend smooths these jitters to show the real drift. The gray dots are your actual ranks, unretouched.
“A segment”: The section between two timing checkpoints. This race has 23, wildly different lengths—that's why the graph spaces them evenly instead of by kilometer.

Where runners drop out on UTMB Mont-Blanc

725 of 2,406 starters didn't reach the finish, that's 30.1%. The median drop-out point is at km 96.14.

DNF count per checkpoint
Checkpoint	km	DNFs
Courmayeur	83.22	129
Arnouvaz	101.37	121
La Fouly	115.92	82
Champex-Lac	130.08	69
Les Contamines	32.44	59
Les Chapieux	52.16	57
Lac Combal	69.76	47
Refuge Bonatti	96.14	25

Real times, segment by segment

Durations measured on starters from the 2026 edition, indices 307 to 946, median 557. The central half of the field runs from 25th to 75th percentile.

Duration of each segment: median and central half of the field
Segment	km	Median	Central half	Measured
Start → Col de Voza	14.45	2 h 04	1 h 48 – 2 h 18	2,391
Col de Voza → Saint-Gervais	8.41	1 h 03	54 min – 1 h 09	2,391
Saint-Gervais → Les Contamines	9.58	1 h 31	1 h 16 – 1 h 41	2,380
Les Contamines → La Balme	8.65	1 h 41	1 h 26 – 1 h 54	2,318
La Balme → Croix du Bonhomme	5.84	1 h 41	1 h 24 – 1 h 54	2,262
Croix du Bonhomme → Les Chapieux	5.23	44 min	36 min – 51 min	2,262
Les Chapieux → Col de la Seigne	10.76	2 h 30	2 h 07 – 2 h 48	2,250
Col de la Seigne → Lac Combal	6.84	39 min	34 min – 46 min	2,246
Lac Combal → Mont-Favre	4	1 h 10	59 min – 1 h 22	2,200
Mont-Favre → Checrouit	4.56	42 min	35 min – 49 min	2,197
Checrouit → Courmayeur	4.9	48 min	39 min – 57 min	2,178
Courmayeur → Refuge Bertone	5.34	1 h 25	1 h 14 – 1 h 37	2,057
Refuge Bertone → Refuge Bonatti	7.58	1 h 30	1 h 13 – 1 h 45	2,049
Refuge Bonatti → Arnouvaz	5.23	1 h 01	50 min – 1 h 08	2,024
Arnouvaz → Grand Col Ferret	4.6	1 h 42	1 h 26 – 1 h 54	1,903
Grand Col Ferret → La Fouly	9.95	1 h 43	1 h 24 – 2 h 00	1,888
La Fouly → Champex-Lac	14.16	2 h 39	2 h 12 – 3 h 12	1,806
Champex-Lac → La Giète	11.49	2 h 55	2 h 24 – 3 h 24	1,728
La Giète → Trient	5.03	1 h 06	49 min – 1 h 16	1,722
Trient → Les Tseppes	4.01	1 h 36	1 h 18 – 1 h 50	1,705
Les Tseppes → Vallorcine	7.31	1 h 36	1 h 22 – 1 h 47	1,697
Vallorcine → La Flégère	11.28	3 h 04	2 h 41 – 3 h 22	1,688
La Flégère → Chamonix	7.04	1 h 15	1 h 02 – 1 h 33	1,680

Only measurable stop times are those at double-timing checkpoints: Courmayeur (median 32 min), Champex-Lac (median 30 min), Vallorcine (median 16 min). Elsewhere, only one passage was recorded: the stop time is unknown there, and this page doesn't estimate it.

Questions about UTMB Mont-Blanc

How many runners DNF on UTMB Mont-Blanc?

725 of 2,406 starters didn’t reach the finish in the 2026 edition, i.e. 30.1%. Split times were recorded bib by bib from the official timing, which only publishes finishers. RAVIT survey of September 1, 2026.

Where do runners DNF on UTMB Mont-Blanc?

Km 83.22: Courmayeur accounts for 129 of 725 DNFs in the 2026 edition. Then Arnouvaz (121) and La Fouly (82); together, 332 DNFs. The last recorded checkpoint is definitive. Log from September 1, 2026.

What's the longest segment on UTMB Mont-Blanc?

3 h 04 median: time from Vallorcine to La Flégère, over 11.28 km, measured on 1,688 runners in the 2026 edition. The middle half of the field ran between 2 h 41 and 3 h 22. Log from September 1, 2026.

What's my time compared to on this page?

To 60 runners closest to your index, in a max 25-point index window, on the edition you pick. On each segment, the reference is runners who reached that checkpoint. DNFs count as long as they were racing.

Does this page compare my race to a prediction?

No, not here. This page compares your rank to that of real runners, segment by segment, with no predictions. Your gap to your own plan is shown in your plan debrief: on the Pacing screen, once your race is done.

Data from this page

Measurements for each edition are downloadable in CSV: one line per segment, with median, quartiles, number of runners measured and DNFs per checkpoint. Comma separator, point decimal, UTF-8 encoding. Reuse conditions for this data

Other races analyzed

Prepare for UTMB Mont-Blanc: profile, aid stations and cut-off times Every race analyzed segment by segment View all trail races in calendar