When was the last eruption at Mount Saint Helens?

May 18, 1980 Mount St. Helens is best known for its major eruption on May 18, 1980, the deadliest and most economically destructive volcanic event in U.S. history .Mount St. HelensVolcanic arcCascade Volcanic ArcLast eruption2004–2008ClimbingFirst ascent1853 by Thomas J. Dryer17 more rows

Where did Mt St Helens erupt?

Washington Mount Saint Helens, volcanic peak in the Cascade Range, southwestern Washington, U.S. Its eruption on May 18, 1980, was one of the greatest volcanic explosions ever recorded in North America.

What dates did Mt St Helens erupt?

April 8, 1980: A series of explosions lasted four hours, the longest yet. April 22, 1980: Eruptions occurred on average from about 1 per hour in March to about 1 per day by April 22 when the first period of activity ceased. May 7, 1980 - May 17, 1980: Small eruptions resumed.

How many times did Mount St. Helens erupt?

Over the last 500 years, Mount St. Helens has had at least four major explosive eruptions and many minor eruptions.