OCC Aid Station Planner
All 11 OCC checkpoints pre-loaded. Enter your goal finish time to get estimated arrival times at every aid station.
Full OCC (Orsières-Champex-Chamonix) course data: aid stations, cutoffs, course profile
Enter a goal OCC finish time and get estimated arrival times at every checkpoint - 60 km with around 3,500 m of climbing, with crew and drop-bag points flagged.
Turns every arrival into a clock time and every cutoff into a margin.
Terrain changes how the goal time is shared between segments, not the total. One surface everywhere cancels out.
Checkpoints (11)
Cutoff Thu 11:30
Cutoff Thu 14:30
Cutoff Thu 17:45
Cutoff Thu 21:15
Cutoff Thu 23:30
OCC
Goal 11:23 · Start Thu 08:15
- Crew may meet you at
- Champex-Lac 7.3 km, by Thu 09:39
- La Giete 18.6 km, by Thu 11:48
- Trient 23.8 km, by Thu 12:41
- Le Tour 46.8 km, by Thu 17:19
- Argentiere 50.2 km, by Thu 17:52
Not published for Tete de Balme, Col des Posettes - check the race manual.
- Drop bags
Not published for Tete de Balme, Col des Posettes - check the race manual.
| Checkpoint | Dist (km) | D+ (m) | Km-effort | Arrive by | Clock | Cutoff | Buffer | Leave by | Seg time | Seg pace/km |
|---|---|---|---|---|---|---|---|---|---|---|
| Start | 0 | 0 | - | 0:00:00 | Thu 08:15 | - | - | - | - | - |
| Champex-Lac | 7.3 | +620 | 13.8 | 1:24:32 | Thu 09:39 | - | - | Thu 10:50Set by Plan de l'Au | 1:24:32 | 11:35 |
| Plan de l'Au | 12.2 | +60 | 6.4 | 2:03:54 | Thu 10:18 | Thu 11:30 | 1h11 | Thu 12:07Set by Trient | 0:39:22 | 8:02 |
| La Gietelikely hiking (pace) | 18.6 | +730 | 14.6 | 3:33:01 | Thu 11:48 | - | - | Thu 13:36Set by Trient | 1:29:07 | 13:55 |
| Trient | 23.8 | +50 | 8.8 | 4:26:44 | Thu 12:41 | Thu 14:30 | 1h48 | Thu 15:36Set by Col de Balme | 0:53:43 | 10:20 |
| Col de Balmelikely hiking (pace) | 33.5 | +1050 | 21.0 | 6:34:54 | Thu 14:49 | Thu 17:45 | 2h55 | Thu 18:12Set by Argentiere | 2:08:11 | 13:13 |
| Tete de Balme | 35.2 | +120 | 3.0 | 6:53:13 | Thu 15:08 | - | - | Thu 18:31Set by Argentiere | 0:18:19 | 10:46 |
| Col des Posettes | 41.8 | +310 | 12.8 | 8:11:21 | Thu 16:26 | - | - | Thu 19:49Set by Argentiere | 1:18:08 | 11:50 |
| Le Tour | 46.8 | +70 | 8.7 | 9:04:08 | Thu 17:19 | - | - | Thu 20:42Set by Argentiere | 0:52:48 | 10:34 |
| Argentiere | 50.2 | +60 | 5.4 | 9:37:06 | Thu 17:52 | Thu 21:15 | 3h23 | Thu 21:44Set by Chamonix (Finish) | 0:32:58 | 9:42 |
| Chamonix (Finish) | 60.0 | +430 | 17.3 | 11:23:00 | Thu 19:38 | Thu 23:30 | 3h52 | - | 1:45:54 | 10:48 |
Champex-Lac
Thu 09:39Leave by Thu 10:50Set by Plan de l'Au
- Dist (km)
- 7.3
- D+ (m)
- +620
- Seg time
- 1:24:32
- Seg pace/km
- 11:35
Plan de l'Au
Thu 10:18Cutoff Thu 11:301h11
Leave by Thu 12:07Set by Trient
- Dist (km)
- 12.2
- D+ (m)
- +60
- Seg time
- 0:39:22
- Seg pace/km
- 8:02
La Gietelikely hiking (pace)
Thu 11:48Leave by Thu 13:36Set by Trient
- Dist (km)
- 18.6
- D+ (m)
- +730
- Seg time
- 1:29:07
- Seg pace/km
- 13:55
Trient
Thu 12:41Cutoff Thu 14:301h48
Leave by Thu 15:36Set by Col de Balme
- Dist (km)
- 23.8
- D+ (m)
- +50
- Seg time
- 0:53:43
- Seg pace/km
- 10:20
Col de Balmelikely hiking (pace)
Thu 14:49Cutoff Thu 17:452h55
Leave by Thu 18:12Set by Argentiere
- Dist (km)
- 33.5
- D+ (m)
- +1050
- Seg time
- 2:08:11
- Seg pace/km
- 13:13
Tete de Balme
Thu 15:08Leave by Thu 18:31Set by Argentiere
- Dist (km)
- 35.2
- D+ (m)
- +120
- Seg time
- 0:18:19
- Seg pace/km
- 10:46
Col des Posettes
Thu 16:26Leave by Thu 19:49Set by Argentiere
- Dist (km)
- 41.8
- D+ (m)
- +310
- Seg time
- 1:18:08
- Seg pace/km
- 11:50
Le Tour
Thu 17:19Leave by Thu 20:42Set by Argentiere
- Dist (km)
- 46.8
- D+ (m)
- +70
- Seg time
- 0:52:48
- Seg pace/km
- 10:34
Argentiere
Thu 17:52Cutoff Thu 21:153h23
Leave by Thu 21:44Set by Chamonix (Finish)
- Dist (km)
- 50.2
- D+ (m)
- +60
- Seg time
- 0:32:58
- Seg pace/km
- 9:42
Chamonix (Finish)
Thu 19:38Cutoff Thu 23:303h52
- Dist (km)
- 60.0
- D+ (m)
- +430
- Seg time
- 1:45:54
- Seg pace/km
- 10:48
Highlighted rows use a pace heuristic (>12 min/km / >19 min/mi) - likely hiking by speed, not grade. The grade-based power-hike cue is ≥15% (see GAP and Incline tools). Times are distributed proportionally by km-effort.
Leave by is the latest you can start the next segment and still make every cutoff ahead of you at this pace - often set by a station further on, not this one. It does not yet subtract the time you spend stopped, so treat it as the optimistic edge.
Cutoff buffers are estimates from your goal time and published barriers. Courses and barriers change - verify against the official race guide.
Next step
OCC course in numbers
- Climbing per km
- 58 m
- ITRA km-effort
- 95 (50K)
- Highest point
- 2,321 m
- Biggest climb
- +878 m over 6.0 km at 14.0% (through Trient)
- Longest descent
- -784 m over 5.8 km at 12.9% (through La Giete)
- Track climbing above 3%
- 41%
- Winning time / cutoff
- 5h00 / 15h15 (3.1x the winner's time)
Section-by-section climbs, descents and grades are on the OCC course page.
About OCC (Orsières-Champex-Chamonix)
OCC (Orsières-Champex-Chamonix) covers 60 km with around 3,500 m of elevation gain, starting in Orsières, Switzerland. The overall cutoff is 15 hours 15 minutes.
Crew access is allowed at Champex-Lac (7.3 km), La Giete (18.6 km), Trient (23.8 km), Le Tour (46.8 km) and Argentiere (50.2 km).
Checkpoint data approximate - verify against the current official race guide at montblanc.utmb.world before your race.
How the splits are allocated
Your goal time is split across the OCC legs by km-effort: distance + gain/100 + loss/200. Full methodology.
Track your OCC plan, crew notes, and live progress in the app
TrailMath uses these models to build periodized plans adjusted to your goals and terrain.
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