About This Race
The 109K stands as the marquee distance at Nice Côte d'Azur by UTMB, tracing a demanding route through the Maritime Alps where the Mediterranean meets genuine mountain terrain. Part of the UTMB World Series, this race draws experienced ultra runners to southern France each September for a course that moves from sea-level Nice into the rugged backcountry of Mercantour National Park. The distance and technical demands require solid ultra experience, though it remains more accessible than the 170K flagship event. The race unfolds across mixed terrain that shifts between coastal trails, alpine singletrack, and brief connecting sections on mountain roads. Runners encounter the full character of the Côte d'Azur's geography: Mediterranean scrubland giving way to pine forests, then higher elevation passages through limestone formations and occasional exposed ridgelines. The September timing typically offers stable conditions, though afternoon heat in lower elevations and potential weather shifts in the mountains remain considerations for pacing and gear choices.
Starting from Nice, the 109K route heads into the Maritime Alps, following a point-to-point or loop configuration that showcases the region's varied topography. The course connects villages and mountain refuges through trail networks that have served local shepherds and hikers for generations, now maintained as part of the extensive Grande Randonnée system. Technical sections require attention to footing on rocky descents, while the mixed terrain allows for rhythmic running on smoother passages between the more demanding segments.
Elevation Profile
Elevation profile estimated from terrain data. Actual course may differ.
The course gains 1,690m over 109km, with the steepest section between km 39–km 39.
Location
Practical Info
Late September brings cooling temperatures with warm afternoons in lower elevations (18-24°C) and cooler conditions in the mountains. Generally stable weather, though afternoon clouds can develop over ridgelines.
NCE - Nice Côte d'Azur Airport
Nice offers extensive lodging options from budget hotels to higher-end properties, with easy access via Nice Côte d'Azur Airport. Book early as September remains popular with tourists visiting the French Riviera.