Poás Volcano
An active volcano an hour from the capital with one of the largest active craters in the world, holding a steaming acid lake you can look straight down into.
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Poás is one of the few places anywhere where you can drive almost to the rim of an active volcano and walk a few hundred metres to look directly into the crater. The main crater is about one and a half kilometres across, among the largest active craters in the world, and at the bottom sits a pale turquoise lake of highly acidic water that steams and sometimes sends up plumes, with sulphurous gas drifting across the rim. A short paved trail leads from the visitor centre to the viewpoint, which makes it accessible in a way that few volcanoes are. Because the volcano is genuinely active and erupted significantly in 2017, closing the park for over a year, visits are now tightly controlled: numbers are capped, tickets must be reserved online in advance, and time at the rim is limited to about twenty minutes, with hard hats issued at times of raised activity.
What you actually see
- The crater and acid lake - the steaming turquoise lake in the vast crater.
- The rim viewpoint - the short paved walk to look straight down into the crater.
- Botos Lagoon - the cold rain-filled crater lake on the second trail, when open.
- The cloud forest - the stunted, wind-shaped vegetation on the volcano's flanks.
When to go
December to April, the dry season, gives the best chance of a clear crater; even then, cloud usually rolls in by mid-morning, so the earliest available slot is by far the best bet. Reserve tickets online days ahead, as slots sell out. The park closes at short notice if volcanic activity rises.
Honest expectations
You are buying a chance, not a view: cloud swallows the crater on many days, particularly after about nine in the morning, and people regularly drive up and see nothing but grey. Time at the rim is capped at around twenty minutes and reservations are compulsory. Sulphur gas can affect those with asthma or heart conditions. Closures happen with little warning when the volcano stirs.
Nearby
The La Paz waterfall gardens and coffee estates of the central valley are close; San José is ninety minutes south.
What to pack for Poás Volcano
Chosen from what this place is for. Tap a kit for the full checklist.
Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.
