description Pluto's Cave Overview
Pluto's Cave is a substantial lava tube located in Siskiyou County, California, on the lower northern flanks of Mount Shasta. The cave was formed roughly 190,000 years ago by subterranean basaltic lava flows that eventually drained, leaving an open tunnel. Much of the cave roof has collapsed over time, creating skylights and rugged pathways through the interior. The site is publicly accessible and utilized by hikers and geology enthusiasts, though navigation requires appropriate footwear and lights.
help Pluto's Cave FAQ
Where is Pluto's Cave in relation to Mount Shasta?
Pluto's Cave lies on the northern side of Mount Shasta in California's Klamath National Forest. Its entrance is reached near the communities and roads northeast of Weed rather than from Mount Shasta's summit routes.
How was Pluto's Cave formed?
Basaltic lava developed a solid outer crust while molten material continued flowing through the interior. When that lava drained away, it left the large hollow tube now known as Pluto's Cave.
Why does Pluto's Cave have several open sections?
Parts of the tube's roof collapsed after the eruption, producing skylights and separate-looking entrances. These openings create transitions between daylight, twilight, and completely dark passages.
What equipment is needed for Pluto's Cave?
Visitors need reliable lights, sturdy footwear, and clothing suited to cold, uneven underground terrain. A backup light is important because the interior extends beyond the daylight reaching through its collapse openings.
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