The Cerro Castillo traverse (Las Horquetas to Villa Cerro Castillo) is a 4-day, 3-night backcountry trek of roughly 51 km (32 miles) in Chilean Patagonia, about 60 km south of Coyhaique on the Carretera Austral. It's the wilder, quieter alternative to Torres del Paine — no refugios, genuine river crossings, and a high scree pass (El Peñón, ~1,450 m / 4,750 ft) — rewarded by the turquoise glacial Laguna Cerro Castillo beneath jagged basalt spires. The best season is December through March.
Cerro Castillo National Park protects a serrated massif that looks like a castle, hence the name. Where Torres del Paine has boardwalks, daily buses and crowds, Cerro Castillo has mud, marked-but-rough trails and, often, the lagoon to yourself.
Fly Santiago to Balmaceda (BBA) — about 2h20 — then transfer ~1 hour to Coyhaique, the regional hub and your last resupply. The northern trailhead at Las Horquetas is about 1.5 hours south of Coyhaique on the Carretera Austral (Route 7); the trek exits at Villa Cerro Castillo, so arrange a pickup or bus back.
Harder than the W Trek. The terrain is rougher (loose scree, real river crossings, no boardwalks), there are no refugios — you camp and carry everything — and the weather is less predictable this far into Aysén. Paso El Peñón is the test: loose footing, steep, and fully exposed to Patagonian wind. Come with solid fitness and prior multi-day trekking experience.
December–March, with January–February the peak. November often still has snow on El Peñón. Outside summer the pass becomes technical and crossings rise.
A −12 °C sleeping bag, a 4-season tent, trekking poles, and sandals for river crossings. Waterproof boots, gaiters, and a genuine rain shell are essential. Coyhaique is your last resupply — buy all food and fuel there.
| Factor | Cerro Castillo | Torres del Paine | | Duration | 4 days / 3 nights | 4–8 days | | Difficulty | Hard | Moderate | | Crowds | Very low | High (Dec–Feb) | | Infrastructure | Camping only | Refugios + marked trails | | Access | Coyhaique (1.5h) | Puerto Natales (3h bus) | | Best for | Experienced trekkers, solitude | First Patagonia trip |
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Yes. The terrain is rougher (loose scree, river crossings, no boardwalks), there are no refugios (camping only), and the weather is less predictable. Good fitness and previous multi-day trekking experience are recommended.
The classic Las Horquetas traverse takes 4 days / 3 nights. A day hike to Laguna Cerro Castillo from Villa Cerro Castillo is possible in 6–8 hours round trip.
Not required but recommended, especially if you're unfamiliar with Patagonian backcountry conditions. The trail is less marked than Torres del Paine and the weather can change rapidly.