Siskiyou County isn’t just a scenic escape. It’s a living, breathing geologic masterpiece. Shaped by fire and time, this region is home to some of the most fascinating volcanic landscapes in the American West. From the towering majesty of Mount Shasta to the surreal lava tubes of Lava Beds National Monument and the bubbling caldera of Medicine Lake, Siskiyou invites you to explore a world where geology and beauty collide.
Mount Shasta: The Sleeping Giant
Rising over 14,000 feet, Mount Shasta is the crown jewel of Siskiyou and one of the most iconic stratovolcanoes in North America. The second highest peak in California, it last erupted over 200 years ago with a potentially active current status, seeing eruptions every 600 years on average. The trails along the slopes are a magnet for climbers, hikers, and spiritual seekers alike. Trails like Panther Meadows and Gray Butte offer stunning views and a chance to walk among ancient lava flows and alpine wildflowers. Whether you’re summiting or simply admiring it from afar, Mount Shasta’s presence is both humbling and awe-inspiring.
MUST SEE
Pluto’ Cave: A lava tube, formed approximately 190,000 years ago during a basaltic lava eruption from a vent about 8 miles northeast of its current location.
Black Butte: A dacite dome formed ~9,500 years ago west of the main peak and can be seen passing by I-5. Explore via the Black Butte trail.
Lava Beds National Monument: Beneath the Surface
Located in rural East Siskiyou lies a completely different volcanic experience, Lava Beds National Monument. This rugged and desolate landscape is home to over 800 lava tubes, which are caves formed by flowing lava thousands of years ago. Visitors can explore a variety of these caves, from easy walks like Mushpot Cave to more adventurous crawls like Catacombs Cave. Above ground, the terrain is dotted with cinder cones, spatter cones, and fields of jagged basalt, offering a glimpse into the violent volcanic past that shaped the region.
MUST SEE
Skull Cave: A dramatic lava tube with a massive entrance and a unique ice floor that persists even in summer. Formed by ancient lava flows, it’s a prime example of lava tube geology and also features small stalactites and stalagmites.
Captain Jack’s Stronghold: A natural fortress of lava rock used during the Modoc War, featuring deep lava trenches and small caves. Challenge yourself and learn some historical context!
Medicine Lake Volcano: Geologic Wonderland
Often overshadowed by its more famous neighbor Shasta, Medicine Lake Volcano is actually the largest volcano by volume in the entire Cascade Range. Unlike Mount Shasta’s dramatic peak, Medicine Lake is a broad shield volcano, known for its gentle slopes and hidden geothermal features. The area is a haven for campers, anglers, and geology buffs. The lake itself, nestled in the caldera, is perfect for kayaking, fishing, or simply soaking in the serenity.
MUST SEE
Glass Mountain: A striking obsidian flow that looks like it belongs on another planet. Explore the glass-like volcanic rock, but beware that this rock can be sharp and should never be removed as souvenirs.
Medicine Lake: A recreation paradise where visitors enjoy camping, boating, fishing, swimming, and hiking. There are five campgrounds in the area, including Medicine, A.H. Hogue, Hemlock, Headquarters, and Schonchin Spring.
Plan Your Geologic Getaway
Whether you’re a geology enthusiast or just someone who loves epic landscapes, Siskiyou’s volcanic wonders offer a journey through time and terrain. Bring your hiking boots, your curiosity, and your camera because the views are as unforgettable as the stories written in stone.
