Tours & timed entry · Washington
Ape Cave Interpretive Site Ticket — timed entry bookable on Recreation.gov, at Gifford Pinchot National Forest. Official listing facts below, plus how its release and cancellation patterns work.
At 2.5 miles long, Ape Cave is the third longest lava tube in North America. Explore a chilly, pitch-black corridor deep beneath the forest floor of Mount St. Helens National Volcanic Monument. A short, paved trail leads to the entrance of the cave, where visitors must descend a series of staircases for self-exploration of the cavern.
| Type | Timed entry — bookable on Recreation.gov |
|---|---|
| Area | Gifford Pinchot National Forest |
| Location | Amboy, Washington |
| Phone (official listing) | (360) 449-7800 |
| Official listing | Recreation.gov — Ape Cave Interpretive Site Ticket |
Tickets and timed-entry inventory on Recreation.gov follows the same physics as campgrounds: a listing-defined release pattern, carts that hold for about fifteen minutes, and sold-out dates that return when plans change — because every ticket in this system can be cancelled, and cancelled inventory comes straight back to the calendar, first-come. The listing text above is the authority for this facility's exact window; our release- windows guide shows how to read any listing's pattern, and how cancellations work explains why "sold out" is a snapshot rather than a verdict.
Planning the wider trip? The park guide ties this listing to the area's campgrounds, guides, and season notes.
On Recreation.gov, via the official listing linked in the facts table. itOpened never takes bookings — we publish the data and watch the calendars.
Timed-entry and ticket inventory recycles: abandoned carts return after about fifteen minutes, and cancellations return dates first-come, all season. Re-check at release times and in the final days before your date.
The official listing classifies it as 'Timed Entry' — the facts table carries the listing's own description of what's included.
Every figure in this article traces to one of the sources above. If a number isn't sourced, we don't print it.
Last updated 2026-10-30.