Hualalai volcano last erupted between 1800-1801, when it produced lava flows from 5 fissure vents that reached the sea and buried Hawaiian villages.
Hualalaibegan to erupt about 800,000 years ago and broke the surface of the sea about 300,000 years ago. Lava flows from Hualalai and Kohala volcanoes (along with coral deposits) have buried most of Mahukona volcano. For residents of the Kona area, keep in mind that Hualalai hasn't erupted since 1801; Mauna Loa is considered active but hasn't erupted since 1984.
While Kilauea may be Hawaii's most famous volcano, Mauna Loa and Hualalai are also active volcanoes. Due to this and the fact that more than 200 years have passed since its last eruption, Hualalai volcano is considered a potentially dangerous volcano on the island of Hawaii that is delayed for an eruption.