Willett Hot Springs, Natural hot spring in Sespe Wilderness, Ventura County, US
Willett Hot Springs is a natural thermal source in the Sespe Wilderness of Los Padres National Forest where warm mineral water flows into a constructed basin. The basin sits along the Sespe River Trail at a junction where hiking routes meet.
Indigenous peoples used this thermal site for generations before it became part of the Los Padres National Forest system. The springs remain among the oldest natural resources managed within this protected area.
The springs serve as a gathering point for backpackers who arrive after days on remote trails seeking warmth and recovery. Soaking here marks a meaningful moment during wilderness expeditions through the surrounding forest.
A National Forest Adventure Pass is required for parking at the Piedra Blanca trailhead, and the hike typically takes 2 to 3 days round trip depending on pace. Bring sufficient water, food, and camping gear since the trail passes through remote terrain with few services.
The basin maintains a steady temperature around 37 to 38 degrees Celsius year-round, regardless of season or weather outside. This consistency makes it a reliable refuge for hikers arriving during colder months when mountain air is bracing.
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