OCC (Orsières-Champex-Chamonix)

OCC Finish Time Predictor

OCC race stats pre-loaded (60 km, 3,500 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.

60km3,500m D+Winner: ~5hCutoff: 15h15

Full OCC (Orsières-Champex-Chamonix) course data: aid stations, cutoffs, course profile

1. Your race

OCC

60 km · 3500 m D+ · 3380 m D-

Different race?

Have the GPX? Measure the exact course in the GPX Explorer

2. How should we estimate you?

From my Strava historyYour last 90 days of real training. Opens the TrailMath app.Read-only access to your activities. Nothing is posted to Strava, and no training plan is created until you ask for one.

Distance (km)

Elevation gain (m)

Elevation loss (m)

Same as gain. Edit if different.

Finish time

Hours, or h:mm

3. Your predicted finish

95.0 km-effort (ITRA, gain only)111.9 km-effort

Add a past race or your index to get a finish time.

OCC finish times by UTMB Index

Predicted finish on the OCC course (60.0 km, 3,500 m D+) for each UTMB Index, with the margin to the 15h15 cutoff.

OCC: predicted finish time by UTMB Index
UTMB Index	Predicted finish	Average pace	Margin to cutoff
850	6h04	6:04 /km	+9h11
800	6h38	6:38 /km	+8h37
750	7h15	7:15 /km	+8h00
700competitive	7h56	7:56 /km	+7h19
650	8h40	8:40 /km	+6h35
600	9h29	9:29 /km	+5h46
550	10h22	10:22 /km	+4h53
500mid-pack	11h19	11:19 /km	+3h56
450	12h23	12:23 /km	+2h52
400back of the pack	13h32	13:32 /km	+1h43
350	14h47	14:47 /km	+0h28
300	16h10	16:10 /km	0h55 past the cutoff

The 15h15 cutoff sits at about Index 333. The typical winning time, 5h00, sits at about Index 959. At the 2026 edition, the median of the 1,556 finishers took 11h23, about Index 497. A model estimate, not an official ITRA or UTMB figure.

From a result you already have

What the predictor gives on OCC for a few common reference results.

OCC: predicted finish from reference results
Road marathon	3h00 → 9h54	3h30 → 11h33	4h00 → 13h12	4h30 → 14h51
50 km trail, 2,000 m D+	5h30 → 8h21	6h30 → 9h52	7h30 → 11h23	8h30 → 12h54

Road marathons use the tool's rougher power-law fallback.

For arrival times at each checkpoint, use the OCC aid station planner.

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.

Predict your OCC finish time from a reference race result, adjusted for the course's 60 km and roughly 3,500 m of elevation gain. The overall cutoff is 15h15.

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 prediction works

Your result becomes a UTMB Index, mapped onto OCC by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.

Build a training plan targeted at your OCC goal time

TrailMath uses these models to build periodized plans adjusted to your goals and terrain.

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