High in the Central Valley of Costa Rica, where mist floats between ridgelines and dense cloud forests surround the land, a giant watches quietly. Poás Volcano, one of the most iconic and active volcanoes in the country, has long been a source of wonder, power, and respect. Its activity is not only a geological phenomenon — it is a reminder that Costa Rica’s natural beauty is also alive, shifting, and very much awake.
A Crater Unlike Any Other
Poás rises to 2,708 meters above sea level and features one of the largest active craters in the world — nearly 1.5 kilometers wide. Inside this immense bowl lies Laguna Caliente, a surreal and acidic crater lake that shifts color depending on volcanic gas content and mineral composition. From eerie grey to bright turquoise, the lake changes like a living canvas.
But beauty here is matched by volatility. The volcano’s activity has shaped the region’s landscape for centuries and continues to do so today.
Recent Activity: A Reminder of Raw Force
In early 2025, Poás Volcano reawakened with intensity. On April 23, it erupted forcefully, sending an ash column over 3.5 kilometers into the sky. The event, recorded and confirmed by Costa Rica’s Volcanological and Seismological Observatory (OVSICORI), marked one of the strongest explosions in its recent eruptive cycle, which began building momentum in late 2024.
Following several explosive events, Costa Rica’s National Emergency Commission (CNE) declared a red alert for the volcano and the surrounding Poás Volcano National Park. Ashfall and gas emissions reached towns nearby, including Grecia and Sarchí, which were placed under orange alerts due to air quality concerns and potential health risks.
Other surrounding regions such as Alajuela and Poás remained under yellow alert, reflecting a situation that, while stable, could change at any time.
Closure of the National Park
On March 28, 2025, authorities ordered the full closure of Poás Volcano National Park. The decision, although difficult for the local economy, was necessary to ensure the safety of both visitors and park rangers. Park officials cited increasing seismic activity, strong gas emissions, and unpredictable ash plumes as justification for the temporary shutdown.
The closure has had a tangible impact. Tour operators, coffee farms, restaurants, and artisan businesses in nearby towns — many of which rely heavily on tourism — have reported income drops between 40 and 67 percent. For communities that once welcomed thousands of visitors each month, the stillness brought by the volcano’s unrest has been deeply felt.
The Science of a Restless Giant
Poás is considered a stratovolcano, built by layers of lava and ash from hundreds of past eruptions. Its activity is fueled by a complex system of underground magma chambers, hydrothermal interactions, and tectonic pressure. Scientists from OVSICORI and the National Seismological Network monitor its behavior constantly, measuring tremors, gas emissions, and crater lake temperature fluctuations.
Despite modern monitoring, predicting the exact behavior of a volcano remains an inexact science. This is why alerts are based not only on past data but on caution and experience — ensuring that both residents and visitors are protected without compromising their connection to this remarkable site.
A Place of Awe, Even in Silence
Even when closed, Poás continues to capture the imagination. Its silhouette dominates the horizon, its influence touches the air and soil, and its legacy is written into Costa Rican culture. In many ways, the volcano is a symbol of balance — between beauty and danger, calm and eruption, silence and sound.
Costa Rica’s volcanic landscapes, including Poás, serve as both a draw for travelers and a case study in how humans and nature coexist. They remind us that the most breathtaking places in the world are often the ones we must approach with the greatest respect.
For now, Poás sleeps with one eye open. And all of Costa Rica watches, waits, and prepares.