Mount Fuji last erupted during the Hōei eruption, which began on 16 December 1707 and continued into early 1708.

Quick Scoop: When did Mt Fuji last erupt?

  • The last confirmed eruption of Mount Fuji is known as the Hōei eruption.
  • It started on 16 December 1707 and ended on 24 February 1708.
  • That means Fuji has been dormant (but still classified as active) for a bit more than 300 years.
  • The eruption was powerful enough that ash darkened the midday sky as far away as Edo (modern Tokyo).

A bit of background

  • Mount Fuji is an active stratovolcano and Japan’s tallest mountain.
  • The 1707 eruption was likely triggered by a major earthquake (magnitude ~8.4) that struck the region 49 days earlier.
  • During the Hōei eruption, massive amounts of ash and other solid material (tephra) were expelled, affecting communities more than 100 km away.

“Latest news” and risk today

  • Geologists still classify Fuji as active, and it is monitored continuously because another eruption would cause severe disruption to the Tokyo region.
  • Seismic studies after the 2011 Tōhoku earthquake suggest volcanism beneath Fuji was “activated,” which keeps scientific interest and risk planning high, but it has not erupted since 1707.
  • Various media and forum discussions often call Fuji “overdue,” but volcanoes do not follow fixed schedules; models can highlight elevated probability, not exact deadlines.

Forum & trending chatter

Online discussions and forum threads often circle around a few themes:

  • Hikers joking nervously about Fuji being “due” and sharing quake/eruption timelines before climbing.
  • Debates between people who see alarmist headlines and geologists pointing out that swarms of small quakes under Fuji do not automatically mean an imminent eruption.
  • Speculation about how disruptive a modern Fuji eruption would be for Tokyo’s infrastructure, air travel, and economy, often citing the scale of ash fall during 1707 as a reference.

“Volcanoes don’t follow timetables” is a common reminder in these discussions: an eruption is possible in our lifetimes, but not predictable to an exact year.

Key facts at a glance

  • Last eruption: 16 December 1707 – 24 February 1708 (Hōei eruption).
  • Time since last eruption: just over 300 years.
  • Status today: Dormant but still classified as an active volcano, monitored 24/7.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.