Ape Cave Interpretive Site
Hiking Area in Cougar
Located near Mount St. Helens, Ape Cave is a 2,000-year-old formation recognized as the longest continuous lava tube in the continental United States. Visitors can choose between an easier Lower Cave walk or a rugged Upper Cave route that requires scrambling over rock piles and scaling a narrow ladder. The cave interior remains a chilly 42°F year-round and requires advance reservations, a forest pass, and personal light sources.
Commenters enthusiastically share fond memories and view the caves as a bucket-list destination. While overall sentiment is very positive, experienced visitors frequently emphasize the necessity of proper gear, with a few expressing frustration over mandatory fees, reservation requirements, and litter along the trail.
- Book your $2 timed reservation online in advance
- Bring a valid forest recreation pass for parking
- Pack reliable light sources like high-powered headlamps or flashlights
- Dress in warm layers to handle the constant 42°F cave climate
- Wear sturdy, grippy footwear for scrambling over rocks in the Upper Cave
- Choose the Lower Cave for a gentler walk or the Upper Cave for a strenuous rock-scrambling route
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