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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
When50 days ago

Who's going to OCC?

I'm running itPlan your weeks and your aid station times I'm crewingWhen to leave, where to park, at every stop I'm pacing or cheeringAsk your runner for their Out Here link

Free. You can start with nothing.

Official website Entry Lottery Aid stations Notify me if this race changes
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 access, 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 access 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 ○ ○ ? ● ?
What it looks like out there

Somebody has been out there with a camera the tables say the climb is long. these say what long feels like.

11 people have been out there with a camera or a microphone.

Photo gallery

Search: OCC Chamonix trail running (photo gallery)

Photo gallery
Forum thread

OCC or CCC?

Forum thread
Written race report

2025 OCC Results: Jim Walmsley, Miao Yao Win Dramatic Races on Alternate Course

Written race report
11 min

UTMB OCC 2025 | 61KM Through the Alps

Vlog · 11 min
2 min

Best of OCC 2025 | HOKA UTMB Mont-Blanc 2025

Recap · 2 min
7 min

OCC 2025 | Official Race Recap | HOKA UTMB Mont-Blanc

Recap · 7 min
2 min

UTMB Mont-Blanc 2022 - OCC : Highlights

Recap · 2 min

OCC 2026 POV: New Course Finish from Tête de Balme to Chamonix

Course preview

+ 3 more.

All (11) Course preview (2) Race report (2) Written race report (1) Recap (3) Vlog (1) Photo gallery (1) Forum thread (1)

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Anything else: [email protected]

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.