Ape Cave 104 mi
A lava tube near Mount St. Helens with two self-guided routes: an easy lower section and a rougher upper one with an 8-foot rock wall to climb. Bring two light sources each.
Cougar, WA, 42°F inside
Caves near Seattle, WA
3 caves you can visit within 250 miles of Seattle. The closest is Ape Cave, about 104 miles away.
Distances are straight-line from downtown Seattle; driving takes longer. Tour details are checked against each cave's own site; the date is on each cave's page.
Horne Lake Caves 164 mi
A provincial park on Vancouver Island with guided cave tours, from a family-friendly 1¾-hour trip to a 5½-hour adventure, plus a cave and karst education centre.
Qualicum Bay, BC
Gardner Cave 247 mi
A Washington state park cave near Metaline Falls, about 2,072 feet long and 39–42°F, with free tours from mid-May that book up weeks ahead.
Metaline Falls, WA, 39–42°F inside