Saint-Pierre, La Reunion, Réunion Island, France · Thursday, October 21, 2027

100 mi

Diagonale des Fous

348 days away

165 km Distance

9,600 m Climbing

10.0 Grit · Elite / extreme

21.3393° S, 55.4781° E© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 58 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Time limit 66 hours 24:00 min/km average. Generous. Walkable throughout for most of the field. Among the most forgiving 100 mi cut-offs we track. Measured against 46 races of the same distance. Cut-off calculator →

Field size ~2,064 Very large. Congested start, busy aid stations.

DUV results for the 2025 edition (175km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, October

Daytime high 24°C

Night low 22°C

Rainfall Mostly dry

Daylight 12 h 40 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 92 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a mountain course. Poles are highly recommended for the sustained climbs.

By UltraHub Expert

👟 gear

With mountain terrain, choose a shoe with aggressive lugs (5mm+) for optimal performance.

By UltraHub Expert

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 165 km of mountain with 9,600 m of ascent.

Trail Running Shoes58 m of climb per kilometre — grip and rock protection before cushioning.
Race NutritionPast 165 km the palate quits before the legs do — carry more than one flavour.
Hydration VestsPole attachment and chest-strap stability on steep ground.
Trekking Poles9,600 m of ascent to walk up.
HeadlampsA 66 h limit puts you out there after dark.

inov-8