Climb Mount Fuji, Then Crawl Under It
Most people picture one adventure in Fujiyoshida: walking up Mount Fuji. Fewer realize there’s a second one directly underneath it, and that the mountain climb itself now comes with rules strict enough to catch unprepared visitors off guard.
The Yoshida Trail summit climb
The climbing season runs strictly from July 1 to September 10, full stop; outside that window, mountain huts close, water stations shut down, and the trail turns genuinely dangerous with sub-zero winds and rockfall risk. Within season, every climber pays a mandatory ¥4,000 fee online in advance through the official portal, and the trail enforces a hard cap of 4,000 climbers per day. The 5th Station gate, where the trail begins at 2,305 meters, closes to anyone without a confirmed mountain hut reservation between 2 p.m. and 3 a.m., specifically to stop “bullet climbing,” the practice of summiting overnight without stopping to rest. Plan on roughly six hours up over volcanic gravel and chain-assisted switchbacks to the crater rim at 3,776 meters, then about three and a half hours down via the separate descending route. One more thing worth knowing before you go: in July and August, the summit is not the postcard white cone you’ve seen in photos. The snowcap is gone by summer, and you’ll be climbing a dark reddish-brown cinder cone the entire way.
Lava tubes beneath the forest
Twenty-five minutes’ drive from town, on Fuji’s western flank, Fugaku Wind Cave and Narusawa Ice Cave run through lava tubes formed during the 864 AD Jogan eruption. Both hold interior temperatures around 0 to 3 degrees Celsius even in peak summer heat, lined with permanent ice pillars and basalt lava stalactites. Ceilings run low in places, so bring or rent a helmet, and expect to duck more than once. Entry costs roughly ¥350 per cave, and unlike the summit climb, there’s no season restriction and no reservation cap; you can do this any day the caves are open.
Verdict: if you only have one adventure day, the caves are the sure thing regardless of weather or season, while the summit climb needs a booked date, a fee paid in advance, and a hut reservation if you’re not finishing before the 2 p.m. gate closure. Book the Yoshida Trail fee the moment your travel dates are fixed; the 4,000-climber cap fills up on popular weekends well before the day itself. For how to reach the 5th Station trailhead, see bus tours in Fujiyoshida .