UTMB Mont-Blanc

Course elevation

Signature sections

• Tour du Mont-Blanc loop · km 0–174

  Long alpine climbs, technical descents, night running, and altitude exposure around the Mont-Blanc massif.

Race overview

UTMB Mont-Blanc is the reference 100-mile mountain ultra: roughly 174 km around the Mont-Blanc massif with close to 10 000 m of climbing. A useful plan has to manage effort caps on long climbs, conservative descending, night fueling, and weather volatility. The current TrainingFlow model treats it as a course-specific effort plan with approximate vertical distribution until detailed course files are imported.

How hard is this course?

Reference table — how the UTMB Mont-Blanc compares to a flat sea-level course for four typical fitness levels. Computed from the route profile, mean course altitude, and typical race-week climate (13 °C / 70 % humidity). Your personal strategy uses your VDOT, per-km splits, nutrition timing, and the typical climate baseline for this static sample; paid strategies use Open-Meteo when a verified race date is inside the forecast window.

Reference nutrition

For a 70 kg runner finishing in 17:11:12 at 13 °C. Adjust to your weight and tolerance — these are ISSN-window targets, not prescriptions.

Carbs / hour

90 g

Total carbs

1547 g

Fluid / hour

640 ml

Sodium / hour

500 mg

FAQ

• How should I pace UTMB Mont-Blanc?

  Treat the preview as an effort plan, not a fixed road-marathon pace table. The course model includes 9900 m of climbing, so climbs, descents, heat, and aid-station timing matter more than average pace.

• How reliable is the current course data?

  Official headline distance and vertical gain are suitable for preview. The per-km elevation profile is approximate and must be upgraded with official GPX for high-confidence paid strategies.