Race Time Predictor

How fast will you run GTC30?

GTC30 race stats pre-loaded (26.1 km, 2,000 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.

26.1km2,000m D+Winner: ~2h54Cutoff: 8h

Full Gran Trail Courmayeur - GTC30 course data: aid stations, cutoffs, course profile

26.1 kmdistance2,000 mD+2,005 mD-56km-effort

GentleSteadySteepVery steep

Your race (done)
About you
Your finish

1Your race

GTC30Official course loaded · 26.1 km · 2,000 m D+Different race?

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

The course
26.1 km, but it costs 56 km-effort. The 2,005 m of descent is where legs go.

2How should we estimate you?

Start with

Pick whichever you have. After your first estimate we ask for the other - two inputs give a firmer read.

Distance (km)

Elevation gain (m)

Elevation loss (m)

Same as gain. Edit if different.

Finish time

Hours, or h:mm

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.

TrailMath
Got a UTMB index? Hand it over, it's the straightest read I get. No index? A long, hilly past race works too.

3 · Your predicted finish

Choose a race or enter its distance and elevation, then add a past result or your index.

GTC30 course in numbers

Climbing per kmClimbing per mile: 77 m405 ft
ITRA km-effort: 46 (20K)
Highest point: 2,524 m8,281 ft
Biggest climb: +878 m over 5.1 km at 16.4% (up to Mont de La Saxe)+2,881 ft over 3.2 mi at 16.4% (up to Mont de La Saxe)
Steepest climb: +166 m over 0.8 km at 21.3% (up to Col Sapin)+545 ft over 0.5 mi at 21.3% (up to Col Sapin)
Longest descent: -614 m over 3.4 km at 17.4% (down to Courmayeur (Finish))-2,014 ft over 2.1 mi at 17.4% (down to Courmayeur (Finish))
Track climbing above 3%: 42%
Winning time / cutoff: 2h54 / 8h00 (2.8x the winner's time)

Section-by-section climbs, descents and grades are on the GTC30 course page.

Predict your GTC30 finish time from a reference race result, adjusted for the course's 26.1 km and roughly 2,000 m of elevation gain. The overall cutoff is 8h.

About Gran Trail Courmayeur - GTC30

Gran Trail Courmayeur - GTC30 covers 26.1 km with around 2,000 m of elevation gain, starting in Courmayeur, Valle d'Aosta, Italy. The overall cutoff is 8 hours.

Crew access is allowed at Mont de La Saxe (5.8 km), Rifugio Bonatti (12.92 km) and Currù (20.31 km).

Checkpoint data approximate - verify against the current official race guide at gtcourmayeur.com before your race.

How the prediction works

Your result becomes a UTMB Index, mapped onto GTC30 by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.

Build a training plan targeted at your GTC30 goal time

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

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