A night-start loop through Volcán Osorno's volcanic slopes in northern Chilean Patagonia
Chile's most emblematic trail running event challenges runners through the volcanic landscapes of Parque Nacional Vicente Pérez Rosales on the slopes of Volcán Osorno. Starting at night from Camping Playa Petrohué on the shores of the turquoise Lago Todos Los Santos, the 100K Ultra Terra accumulates three full vertical kilometers across four major climbs — to the Ski Center on Osorno, La Roca Vulcano, Quebrada Jurásica, and Cerro La Picada — before finishing back at the lake after 25 hours of racing through old-growth forest, volcanic ash, and exposed ridgelines. Variable weather, technical footing on volcanic rock and sand, and remote mountain terrain make this one of South America's most demanding 100K courses.
Recommended for seasoned ultrarunners
Puerto Varas, Los Lagos, ChileDecember 06, 2025
| Location | km | Elevation |
|---|---|---|
Start Start | 0.0 | 194 m |
Finish Finish | 94.8 | 422 m |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
Camping available at the start/finish area at Camping Playa Petrohué on the shores of Lago Todos Los Santos. Parking also available near the start.
Temperatures can drop to -5°C with wind and snow at higher elevations, particularly on the overnight climb to the Ski Center
December weather in southern Chile is unpredictable — conditions can swing from summer heat at the lake to winter cold on the volcano within the same race
Exposed ridgelines above Petrohué experience strong, gusty winds — particularly on Quebrada Jurásica and the Paso Desolación sections
No required gear specified
No recommended gear specified
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