[3] In 2003, on the 25th anniversary of the first running, the Marathon du Mont Blanc event was added to the race schedule.

[5] Distance: 3.8 km Total Ascent: 1,000 m Start Time: 14:00 Course cut-off: N/A Number of entries: Unknown Distance: 10 km Total Ascent: 325 m Start Time: 13:00 Course cut-off: Unknown Number of entries: 1,500 Distance: 23 km Total Ascent: 1,665 m Start Time: 08:00 Course cut-off: 5 hours Number of entries: 1,000 Distance: 42 km Total Ascent: 2,730 m Start Time: 07:00 Course cut-off: 9 hours Number of entries: 2,000 Distance: 92 km (2023) Total Ascent: 6,330 m Start Time: 04:00 Course cut-off: 24 hours Number of entries: 1,000 Course Description:[6][7] Starting on the Place de l'Église in Central Chamonix the route climbs via Refuge de Bel Lachat to Le Brévent (2,525 m), the runners then descend to Plan Praz.

From Plan Praz the course traverses the Aiguilles Rouges to La Flégère and via Lac des Chéserys and Col de Montets to Le Buet (1,330 m).

Distance: 21 km (2023) Total Ascent: 1,450 m Start Time: 19:30 Course cut-off: 6:00 hours Course Description:[8] Starting from the center of Chamonix, the first kilometers will lead you to the Arveyron before taking the path of the crystalliers to join the Planards and the path leading to the alpine pastures of Blaitière.

From there you will continue in direction of the refuge of the Plan of the Aiguille (2,207 m)[9] before descending on Chamonix by the same way as the 90 km of the Mont Blanc.