Exactly 100 years after California's last volcanic eruption ... Mount Rainier, Mount Hood and Mount St. Helens, which erupted in 1980.When Lassen exploded about 4:30 p.m. on May 22, 1915, it ...

The last eruption took place in the year 1984. The Mount Hood is the highest peak of Oregon and is also an active stratovolcano. The last significant eruption took place somewhere around 1781-1782.