Loading...
Ultras · CH · Valais

OCC

OCC 2026
Scheduled
2026 reroutes the upper section between Col de Balme and Col des Posettes with a new high point at Tete de Balme (2,321m); the finish-approach section between Argentiere and Chamonix was also updated to follow the Arve's southern side and the Petit Balcon Sud. The organizer states neither change affects total distance or elevation gain.
Race dateAugust 27, 2026
Duration1 day
Start8:15am
Whenin 5 days
Official website Entry Lottery Aid stations
Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Distance 60K
Climb 10,945 ft
Descent 10,548 ft
High point 7,615 ft
Time limit 14:30:00
Aid stations 15
Started not checked yet
Finished not checked yet
Finish rate not checked yet
The course

Where it goes point to point · 15 aid stations

The 50K category final of the UTMB World Series. From Orsieres in Switzerland's Val d'Entremont, the course reaches Champex-Lac, crosses the Franco-Swiss border at Col de Balme, and finishes in Chamonix via the valley's northern balcony trails. In 2026 the upper section between Col de Balme and Col des Posettes was rerouted with a new high point at Tete de Balme (2,321m); the organizer states this change does not affect total distance or elevation gain.

The race

What this one is

The 50K category final of the UTMB World Series: a technical 60km course from Orsieres in Switzerland's Val d'Entremont to Chamonix, France, via Champex-Lac, Trient and the Franco-Swiss border at Col de Balme.

Getting in

Getting in Entry, lottery and what the race asks of you before race day.

Lottery
Yes montblanc.utmb.world
Lottery opens
not checked yet
Lottery draw
not checked yet
Field cap
not checked yet
Registration
UTMB montblanc.utmb.world
Qualifying
Requires a valid UTMB Index in category 20K, 50K, 100K or 100M. OCC access is opened to any runner holding at least one Running Stone (via the lottery) or an elite qualification earned directly through UTMB World Series races/majors. montblanc.utmb.world
Minimum age
20 montblanc.utmb.world
Transfers
No montblanc.utmb.world
Deferrals
No montblanc.utmb.world
Crew, pacers and drop bags

The rules that shape your day Anything marked "not checked yet" is a gap in what we hold, never a no from the race.

Crew allowed
No montblanc.utmb.world
Vehicles per runner
not checked yet
Pacers
No montblanc.utmb.world
Muling
Not allowed montblanc.utmb.world
Drop bags
Yes HOKA UTMB Mont-Blanc 2026 Runner's Guide (Issuu), p.50 'OCC PROGRAM'
Cupless
Yes montblanc.utmb.world
Course marking
Fully Marked montblanc.utmb.world
Night running
Yes montblanc.utmb.world
Dogs
Not allowed montblanc.utmb.world
Headphones
Allowed montblanc.utmb.world
Crew rules
No assistance is allowed at any point during the OCC. Family/friends may briefly greet a runner only inside the marked 'accompanying zone' (roughly 500m either side of an aid station on UTMB/CCC/TDS); pace-setting and outside help are prohibited race-wide. montblanc.utmb.world
Pacer rules
Again, to ensure equality between competitors ... it is forbidden to be accompanied during all or part of the race by a person who is not a participant, outside of the zones of tolerance ... This authorizes short walks for family and friends but forbids pace setters. montblanc.utmb.world
Drop bag rules
Each runner is issued one 30L organizer spare bag. For OCC it is dropped at Orsieres (Salle Edelweiss / Place des Ides) Thursday 27th between 06:30 and 08:00, and picked up at Chamonix Centre Sportif from Thursday 27th 09:30 to Friday 28th 09:00. There is no mid-course (on-route) drop-bag access described for OCC, unlike TDS's additional Beaufort bag. HOKA UTMB Mont-Blanc 2026 Runner's Guide (Issuu), p.50 'OCC PROGRAM'
Cutoff philosophy
A runner must leave each checkpoint before its published time barrier to continue; barriers fall at Plan de l'Au (11:15), Trient (14:15), Col de Balme (17:30), Argentiere (21:15) and the finish in Chamonix (23:30), a 14h30 limit from the 08:15 start. A runner stopped by a barrier is bibbed-out and transported back by the organizer. HOKA UTMB Mont-Blanc 2026 Runner's Guide (Issuu), p.49 'OCC TIME CHARTS'
Aid stations

Every stop, and what you get there ● yes   · no   ? nobody has checked   – does not apply to this race

Mile Station Cutoff Crew Bag Pacer Med To next
0.00 Orsieres
3,002 ft
 ? · · ? ● 4.54
4.54 Champex-Lac
4,820 ft
 ? · · ? ● 2.98
7.52 Plan de l'Au
4,377 ft
 11:15am · · ? ? 4.04
11.56 La Giete
6,191 ft
 ? · · ? ? 3.17
14.73 Trient
4,291 ft
 2:15pm · · ? ● 3.66
18.39 Chalet des Grands
6,890 ft
 ? · · ? ? 2.36
20.75 Col de Balme
7,224 ft
 5:30pm · · ? ● 1.06
21.81 Tete de Balme
7,589 ft
 ? · · ? ? 3.73
25.54 TC Vallorcine
6,335 ft
 ? · · ? ? 0.37
25.91 Col des Posettes
6,552 ft
 ? · · ? ? 3.17
29.08 Le Tour
4,839 ft
 ? · · ? ? 2.11
31.19 Argentiere
4,117 ft
 9:15pm · · ? ● 2.80
33.99 Le Lavancher
3,999 ft
 ? · · ? ? 1.55
35.54 Les Bois
3,681 ft
 ? · · ? ? 2.43
37.97 Chamonix
3,396 ft
 11:30pm · · ? ● ?
Add to this page

What you know every one of these is read by a person before it changes anything

Ran this race? Tell the next runner what you know.

Nobody sees it until we have read it. No account, no sign-in.

Leave blank if it applies to the whole race.

Leave blank if it is not about one particular stop.

Optional. Something like “Cal Street, mile 62 to 78”.

Write it the way you would say it to someone at the start line.

Optional, and it decides nothing. It only tells the next runner where this is coming from.

Optional.

Optional, and never shown on the page. Only so we can ask you a question about this note.

Leave this field blank.

See something wrong or out of date? Suggest an edit.

This changes nothing on the page on its own. Somebody checks it against the race first.

Optional. Filled in for you when you start from a specific line on the page.

Copy it as it appears, so we can find it.

The corrected value.

Required. Where it came from: the race email, the runner manual, what you saw on the day.

Optional.

Optional. A screenshot or a photo of the sign works.

Optional, and it decides nothing.

Optional.

Optional, only so we can come back to you about this correction.

Leave blank if it is about the whole race.

Leave blank if it is not about one particular stop.

Leave this field blank.

Seen a course preview or a film of this one? Send it over.

Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.

Required. A line is plenty. Where the climbs are, what the footing does, what the last twenty miles look like.

Optional, and it decides nothing.

Optional.

Optional, and never shown on the page. Only so we can ask you a question about this one.

A YouTube link, a race report, a photo gallery, whatever it is.

Optional, and we credit them on the page.

Leave this field blank.

Have the GPX? Send us the link.

We want the address of the file the race publishes, not the file. We download it from there so the page can say where the line came from.

The page or file on the race's own site.

Optional, and only so we can ask you a question about it.

Are you the race director? Get in touch and we'll make it right.

We read every one of these and we write back. Every fact here carries the source it came from, and the way a wrong one gets fixed is a person checking it against what you tell us.

Required, because this is a conversation and we write back.

Tell us what is wrong, out of date, or missing on this page. We read every one of these and we will get back to you.

Optional.

So we know who we are writing back to.

Optional. Director, assistant, comms, whoever you are.

Leave this field blank.

Where this came from. Every fact on this page records its source and when we last checked it: 247 sources for this race. Hover a source link to read the sentence it came from.
54% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.
See something wrong or out of date? Suggest an edit
Ran this race? Tell the next runner what you know
Got footage of this course? Send us the link
Are you the race director? Get in touch and we'll make it right.
Anything else: [email protected]
Running this one?

NavRun builds your pacing from your own training, then turns it into a plan your crew can follow: when to leave and where to park.

Start free