UTMB Aid Station Planner
All 17 UTMB checkpoints pre-loaded. Enter your goal finish time to get estimated arrival times at every aid station from Chamonix to Chamonix.
Enter a goal UTMB finish time and get estimated arrival times at all major checkpoints from Chamonix through Courmayeur and Champex-Lac back to Chamonix - 171 km and around 10,000 m of climbing, with crew and drop bag points flagged.
Checkpoints (18)
About UTMB Mont-Blanc
The Ultra-Trail du Mont-Blanc is a 171km loop circumnavigating the Mont-Blanc massif through France, Italy, and Switzerland, with 10,000m of elevation gain and loss. Starting and finishing in Chamonix, it is one of the most competitive and sought-after ultra-trail races in the world.
Key sections and where the race is won and lost. The opening 50km to Les Chapieux are deceptively demanding - three significant cols (Col du Voza, Col du Bonhomme, Col de la Croix du Bonhomme) set the tone. Most DNFs happen in the 45km section between Courmayeur (79km) and Champex-Lac (125km), which has no crew access except La Fouly (116km). The final climb from Vallorcine to La Flegere (149-161km) at 1200m of gain after 150km of racing is where the race truly ends for many runners.
Crew access points: Saint-Gervais (22km), Courmayeur (79km), Champex-Lac (125km), Vallorcine (149km). Drop bags allowed at: Les Contamines (31km), Les Chapieux (50km), Courmayeur (79km), Champex-Lac (125km), Trient (139km).
Pacing guidance. The planner uses TrailMath's km-effort model to distribute your goal time across segments proportionally to their effort cost. For a 30-hour finish, expect roughly: Saint-Gervais 3:30, Courmayeur 13:00, Champex-Lac 21:00, Vallorcine 26:30. These are effort-proportional estimates - adjust for night penalty (15-20% slower between midnight and 5am) and your individual strengths on climbs vs descents.
Checkpoint data approximate - verify against current official UTMB race guide at utmb.world before your race.
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