Diagonale des Fous Finish Time Predictor
Diagonale des Fous race stats pre-loaded (180.6 km, 10,199 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.
Full Diagonale des Fous (Grand Raid Réunion) course data: aid stations, cutoffs, course profile
1. Your race
2. How should we estimate you?
Same as gain. Edit if different.
Hours, or h:mm
3. Your predicted finish
282.6 km-effort (ITRA, gain only)333.4 km-effort
Add a past race or your index to get a finish time.
Diagonale des Fous finish times by UTMB Index
Predicted finish on the Diagonale des Fous course (180.6 km, 10,199 m D+) for each UTMB Index, with the margin to the 66h00 cutoff.
| UTMB Index | Predicted finish | Average pace | Margin to cutoff |
|---|---|---|---|
| 850 | 22h59 | 7:38 /km | +43h01 |
| 800 | 25h08 | 8:21 /km | +40h52 |
| 750 | 27h28 | 9:07 /km | +38h32 |
| 700competitive | 30h01 | 9:58 /km | +35h59 |
| 650 | 32h49 | 10:54 /km | +33h11 |
| 600 | 35h52 | 11:55 /km | +30h08 |
| 550 | 39h13 | 13:02 /km | +26h47 |
| 500mid-pack | 42h52 | 14:14 /km | +23h08 |
| 450 | 46h51 | 15:34 /km | +19h09 |
| 400back of the pack | 51h13 | 17:01 /km | +14h47 |
| 350 | 55h59 | 18:36 /km | +10h01 |
| 300 | 61h12 | 20:20 /km | +4h48 |
The 66h00 cutoff sits at about Index 258. The typical winning time, 23h30, sits at about Index 838. At the 2025 edition, the median of the 2,064 finishers took 50h58, about Index 403. A model estimate, not an official ITRA or UTMB figure.
From a result you already have
What the predictor gives on Diagonale des Fous for a few common reference results.
| Road marathon | 3h00 → 37h43 | 3h30 → 44h00 | 4h00 → 50h17 | 4h30 → 56h34 |
|---|---|---|---|---|
| 50 km trail, 2,000 m D+ | 5h30 → 31h37 | 6h30 → 37h22 | 7h30 → 43h06 | 8h30 → 48h49 |
Road marathons use the tool's rougher power-law fallback.
For arrival times at each checkpoint, use the Diagonale des Fous aid station planner.
Diagonale des Fous course in numbers
- Climbing per km
- 56 m
- ITRA km-effort
- 283 (100M)
- Highest point
- 2,476 m
- Biggest climb
- +1,168 m over 19.0 km at 6.0% (through Domaine Vidot)
- Steepest climb
- +946 m over 4.8 km at 19.3%
- Longest descent
- -1,990 m over 18.5 km at 10.3% (down to Ilet Savannah (base vie))
- Track climbing above 3%
- 40%
- Winning time / cutoff
- 23h30 / 66h00 (2.8x the winner's time)
Section-by-section climbs, descents and grades are on the Diagonale des Fous course page.
Predict your Diagonale des Fous finish time from a reference race result, adjusted for the course's 180.6 km and roughly 10,199 m of elevation gain. The overall cutoff is 66h.
About Diagonale des Fous (Grand Raid Réunion)
Diagonale des Fous (Grand Raid Réunion) covers 180.6 km with around 10,199 m of elevation gain, starting in Saint-Pierre, Réunion, France. The overall cutoff is 66 hours.
Crew access is allowed at Domaine Vidot (14 km), Notre-Dame de la Paix (33.4 km), Nez de Boeuf (45.4 km), Mare à Boue (55.6 km), Gîte de Bélouve (76.4 km), Hell-Bourg (base vie) (80.4 km), Départ Sentier Scout (95.8 km), Grand Place les Bas (107.6 km), Roche Plate - Plateau Cerf (116.2 km), Ilet Savannah (base vie) (140.3 km), La Possession (154.9 km), Grande Chaloupe (164.3 km) and Colorado (173.6 km). Drop bags are available at Hell-Bourg (base vie) and Ilet Savannah (base vie).
Checkpoint data approximate - verify against the current official race guide at grandraid-reunion.com before your race.
How the prediction works
Your result becomes a UTMB Index, mapped onto Diagonale des Fous by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.
Build a training plan targeted at your Diagonale des Fous goal time
TrailMath uses these models to build periodized plans adjusted to your goals and terrain.
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