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mi/ftkm/m
45.72km
Distance
2,664m
Elevation D+
2025
Latest Edition
Get Your Predicted Finish Time
Use our predictor tool to estimate your finish time based on your UTMB Index and data from 16 finisher records.
Open Time Predictor🌍
Racing in Mexico?
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Hotels near Ultra Trail Oso Negro 40km
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Gear up for your 46km race
Trail Shoes
Rocky alpine terrain demands aggressive grip. Inov-8 excels here. Decathlon's MT2 offers similar traction at a lower price point.
Hydration Vest
Essential for carrying water and nutrition. Salomon vests are popular for good reason, but Decathlon's alternatives do the job at half the price.
Trekking Poles
Trekking poles save energy on big climbs. Collapsible aluminium poles work well for most runners.
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