Diagonale des Fous
Saint-Pierre, La Réunion
163
km
9,643
D+
2,400
max alt.
6
ITRA pts
Available distances
Course
The Diagonale des Fous crosses Reunion Island from south to north, passing through three volcanic cirques and the Piton de la Fournaise volcano. This 163km ultra marathon features 9,643m of elevation gain in extreme tropical conditions.
Race profile
Diagonale des Fous is a 163 km trail race with 9,643 m of elevation gain, located in Saint-Pierre, La Réunion. The next edition is scheduled for 22 October 2026.
The course reaches a maximum altitude of 2,400 m. The race is rated 6 ITRA points and features Montagne, Volcanique terrain. 4 distances are available for runners.
Approximately 2,500 runners cross the finish line each year. Find all official information on the race website.
Frequently asked questions
How long is the Diagonale des Fous?
The Diagonale des Fous is 163 km (101 miles) with 9,643 m of elevation gain, crossing Reunion Island from south to north.
When does the Diagonale des Fous take place?
The Diagonale des Fous takes place in October, during the Grand Raid de La Réunion which features 4 races in total.
What is the DNF rate of the Diagonale des Fous?
The DNF rate is approximately 40%, one of the highest in the world. The heat, humidity and extreme elevation gain explain this figure.
How do I qualify for the Diagonale des Fous?
Registration is through a lottery on grandraid-reunion.com. Medical and experience criteria are required.