Ultra Trail Oso Negro
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About the race
Ultra Trail Oso Negro is a series of mountain trail races organized by Matacanes Trails in the Sierra de Santiago, Nuevo León. The event program for January 2027 includes multiple distances that follow routes through forests and river valleys of the sierra.
The listed race options and key metrics are:
- 100K : route in the Sierra de Santiago with a total ascent of 5300 m plus and an ITRA grade of 4; noted as a 100K M event.
- 50K : mountain ultra with 3200 m plus ascent and an ITRA grade of 3; listed as a 50K M event.
- 30K : trail run with 2000 m plus ascent and an ITRA grade of 2.
The schedule shows main race activity on January 23, 2027, and a volunteer route activity on January 22, 2027. Descriptions emphasize varied forested scenery and river landscapes along the routes. Pricing information appears for some distances in Mexican pesos. The event materials reference ITRA ratings and a mention of Western States for the 100K category. The organizer provides pre-registration options and volunteer opportunities. Visit the organization's website for the most recent information.
