On May 17, 1953, an eruption occurred that started a cycle that lasted until 1956.
At least two people were reported missing.

Poás was near the epicenter of a 6.1-magnitude earthquake in January 2009 that killed at least forty people and affected Fraijanes, Vara Blanca, Cinchona (the most affected area), the capital San José, and the Central Valley region of Costa Rica.

There was also eruptive activity in 2009 involving minor phreatic eruptions and landslides within the northern active crater.
 Poás eruptions often include geyser-like ejections of crater-lake water.

On February 25, 2014, a webcam from the Volcanological and Seismological Observatory of Costa Rica (OVSICORI) captured the moment a dark cloud exploded about 1,000 feet in the air from a massive crater of the Poás Volcano.
 This volcano remains active today.

Poás is one of 9 volcanoes currently monitored by the Deep Earth Carbon Degassing Project.
The project is collecting data on the carbon dioxide and sulfur dioxide emission rates from subaerial volcanoes.
On May 17, 1953, an eruption occurred that started a cycle that lasted until 1956. At least two people were reported missing.
Poás was near the epicenter of a 6.1-magnitude earthquake in January 2009 that killed at least forty people and affected Fraijanes, Vara Blanca, Cinchona (the most affected area), the capital San José, and the Central Valley region of Costa Rica.
There was also eruptive activity in 2009 involving minor phreatic eruptions and landslides within the northern active crater.  Poás eruptions often include geyser-like ejections of crater-lake water.
On February 25, 2014, a webcam from the Volcanological and Seismological Observatory of Costa Rica (OVSICORI) captured the moment a dark cloud exploded about 1,000 feet in the air from a massive crater of the Poás Volcano.  This volcano remains active today.
Poás is one of 9 volcanoes currently monitored by the Deep Earth Carbon Degassing Project. The project is collecting data on the carbon dioxide and sulfur dioxide emission rates from subaerial volcanoes.
Poás Volcano