Ultra Trail Oso Negro
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Ultra Trail Oso Negro 50K
Ultra Trail Oso Negro 50K is a mountain trail race held in Santiago, Nuevo Leon, Mexico on 23 January 2027. The route covers approximately 47.8 km (race distance reported also as 48.41 km) with positive elevation gain around +2,990 m to +3,200 m. The course moves from the Plaza Principal of Santiago through mountain terrain and marked natural landmarks.
The route summary lists these sections: ascent toward Puerto Gringo, technical descent to Los Chorros via the Cuartones path, crossing the Cañón de las Ánimas, passage through the El Manzano forest, approach to Cascada Cola de Caballo, and return via the Brecha del Agua to the finish in the Plaza Principal de Santiago.
Key event details: maximum allowed time 12 hours, minimum age 18 years, field cap 300 runners, and five aid stations distributed roughly every 10 kilometers with food and water available at some points. Reported altitude range is 453 m minimum to 1,777 m maximum. Participants must carry mandatory equipment including a hydration pack, spare batteries for a light, an electronic map on phone or watch, whistle, emergency blanket, and a water container or cup; poles and gloves are optional.
Logistics notes: bib pickup is scheduled the day before the race at Plaza Principal de Santiago; an event-day accident insurance option is offered for an additional fee. Awards include trophies for the top three in each category and the top three overall. Visit the organization's website for the most recent information.