How Many Times has Mt St Helens Erupted?
It is hard to say how many times Mount Saint Helens has erupted because not all of its eruptions are devastating. The most recent eruption was in 2004, and it went relatively unnoticed. The last catastrophic eruption was in 1980, and there is evidence that Mt. Saint Helens erupted 10 times in the 200 years prior to 1980.