Pluto's Cave


Ruggged interior of Pluto's Cave

Pluto's Cave is a lava tube that was formed by an eruption of basaltic lava which originated from a vent about 8 miles to the northeast, between Deer Mountain and The Whaleback. Visitors can safely hike approx 1200 feet into the cave.

At a Glance

Fees No fee
Permit Info: Permits are not required to enter the cave. Be prepared with warm clothing, sturdy, non-skid shoes and extra flashlights.
Open Season: May
Usage: Light
Restrictions: Water and garbage service are not provided. Camping is not permitted at Pluto's cave. No food or drink inside the cave. Pets are not allowed inside the cave. No fires, torches or smoking in the cave. Pack out all trash and litter. Human waste is not permitted in the cave. Plan ahead!
Closest Towns: Weed 11 miles
Water: None
Restroom: None
Operated By: US Forest Service

General Information


From I-5 in Weed, CA travel northwest on US Hwy 97 approx 7 miles to County Road A-12. Turn left and go approx 3.3 miles to Forest Road 43N30. Turn left go approx .2 mile to the parking area.

General Notes:

Caves have special, sensitive ecosystems.  A variety of rare or endangered plants and animals are some of the more significant resources in caves.  Caves are delicate and must be used wisely to avoid damage.  Unlike the surface environment, which, in time, can heal its wounds, a cave, once damaged, remains that way forever.


Park in designated area only.  Do not drive beyond the parking area or off road.



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  • Weed Free Forage
    It is a violation of rule (FS) and law (State of Montana) to utilize forage or mulch materials that contain the seeds of noxious weeds.


  Area/Length : 
1200 ft

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