As a dormant volcano close to many cities, Mt. Fuji is vigilantly watched by many agencies and scientists who constantly analyze data to determine if it's safe to climb.
The last eruption of Mt. Fuji was over 300 years ago in 1707. The eruption before that was in 864, and the one before that was over 2,300 years ago. That is to say, an eruption of Mt. Fuji in our current life-span is highly unlikely, but despite being categorized as a dormant volcano by the Japan Meteorological Association, there is always a risk of eruption when planning on climbing any volcano which is not categorized as "extinct".
As described in our Terms and Conditions that all participants agree to when booking:
FMG uses the Japan Meteorological Agency (JMA) as a guide to the current safety of climbing Mt. Fuji as described on their website at www.jma.co.jp or specifically at this hyperlink: http://www.jma.go.jp/en/volcano/map_3.html.
If a cancellation request due to volcanic or other destabilizing activity is received and the JMA alert level for Mt. Fuji is listed as level 1 (lowest risk), then the standard cancellation policy will apply as the scientists at JMA feel that Fuji is safe to climb.
If a cancellation request due to volcanic or other destabilizing activity is received and the JMA alert level for Mt. Fuji is listed as level 2 (do not approach the crater), then a 50% refund will be given to the requesting client as the JMA Scientists still believe that it is safe to climb, but not to approach the crater.
If JMA raises the alert level for Mt. Fuji to level 3 (do not approach the mountain), all trips will be cancelled and all booked clients will receive a 75% refund.