Volcán Poás Active Crater

Fourth attempt over three years. Two of my four visits the crater was closed for high sulphur output. Third visit: open but no visibility at all — solid white cloud, standing on the platform seeing nothing. This visit: open, partial cloud, and a ten-second window when the cloud parted and I saw the lake. I think about those ten seconds often. I will go again. I am not sure this system of luck is an experience I would recommend to someone with limited time.

Got there at 7am in perfect conditions in January — completely clear from the parking lot, not a cloud over the crater, and the acid lake was visible in full. The scale is hard to process: the caldera is far larger than the photos suggest and the pale grey-green colour of the lake and the total absence of vegetation in the crater combine into a genuinely lunar landscape. Stayed for an hour before the clouds came in. Exactly this.

Drove up with family from San José — 45 minutes, entry fee paid, masks available for sulphur, and the crater was completely invisible inside cloud. Waited 45 minutes on the platform. Nothing cleared. The ranger said this happens most of the time in March. There was nothing else to do at the park and we drove home. I understand the volcano does not owe me a view — but I would not recommend making this a primary destination without checking the week's forecast in detail.

The crater was closed on our first attempt due to elevated sulphur. We tried again two days later — open but cloud. At the moment we were about to leave the cloud thinned enough to see the crater rim and about 40% of the lake surface. That was extraordinary. But the overall ratio of effort to outcome across two attempts was poor. Best for people who can be spontaneous about it — not for people building a day trip around it.