Description : What are the odds of the Yellowstone volcano erupting?
Last Answer : About 1 in 730,000. Yellowstones last super volcanic eruption was approx. 640,000 years ago. It's average time between eruptions is 730,000 years. Was a Super Volcano every 600,000 to 800,000 years ... activity just settles down and it sleeps for another 150,000 years, don't hold your breath yet.