Crystal Cave
Sequoia National Park, CA, 50°F inside
A lava tube in Lassen National Forest with a self-guided trail about a third of a mile long. It's completely dark, so bring a flashlight.
Tickets and timing
- Hours
- Dawn to dusk, usually late April to October, after the snow melts.
Getting around underground
- The walk
- About 1/3 mile on a rough, jagged floor. Wear sturdy shoes; no crawling needed.
Dogs, weather and what to wear
- Dogs
- Not allowed.
- Temperature
- 46°F / 8°C
Good to know
- On site
- vault toilets, picnic area
Getting there
Subway Cave is in or near Old Station, CA.
Parking: Parking area; donations at the fee tube.
- Sacramentoabout 145 miles
Distances are straight-line from each city center.
Questions people ask
How cold is it inside Subway Cave?
46°F / 8°C.
Are dogs allowed at Subway Cave?
Not allowed.
Listed in: self-guided caves, lava tubes
Checked on 2026-10-23 against fs.usda.gov (Subway Cave, Lassen National Forest). Prices and hours change, so confirm on the official site before you drive out.