Cerro Castillo is 75 km south of the city of Coyhaique along Carretera Austral. There is a small village Villa Cerro Castillo just off the road. The base of the mountain can be approached from the road in one day along Estero Parada river. An alternative is the excellent 4-day hike that starts on a spot called Las Horquetas Grandes on Carretera Austral, goes through forests, has two river crossings (no bridges), and goes over a 1,400 m mountain pass adjacent to the rock walls of Cerro Castillo. The area is remote and sees less than one hiking party per day during the season
