About This Route
The O Circuit fully loops Torres del Paine National Park at 76 kilometers over 7 to 9 days, contrasting the W Trek with remote backcountry like the wild John Gardner Pass. Enter via Laguna Amarga, circle counterclockwise past Grey Glacier, cross exposed passes, and exit via Laguna Verde. This expert route features fewer crowds and untouched valleys, but CONAF reports higher incident rates from isolation. Adhere to Leave No Trace: bury human waste 200 feet from water, use established sites only.
Safety Considerations
John Gardner Pass poses avalanche and cornice fall risks; time crossings for calm mornings per ranger advice. Katabatic winds blast 120 km/h from Grey Glacier, risking gear blowaways. Multi-day remoteness means self-sufficiency; no refugios on the back half. Glacial moraine scrambling demands crampons for ice travel. Water purification essential from silty sources; giardia cases noted in forums. Sun exposure intensifies with snow reflection; use Buff neck gaiters. Permits via CONAF online, mandatory park fees.
Essential Gear
Osprey Xenith 85L for bulkier loads. Montbell Plasma 1000 down jacket for -10C nights. Black Diamond Raven crampons, Petzl ice axe for passes. Big Agnes Copper Spur tent, Snow Peak GigaPower stove. SPOT Gen4 satellite tracker, Suunto 9 Peak watch for altimeter navigation.
Emergency Tips
PLB activation priority in passes; CONAF patrols Laguna Verde exit. Hypothermia protocol: change wet layers, share tent warmth. Injury evac via horse from Campo Italiano if feasible.