Most probably January, depends on the side/direction (azimuth) you approach (usual avalanche slope theory applies). I have to get back to one of those 5th Station 5 Lakes District, I have to figure out what their snow plowing rules are. I believe there is a small ski area on the NW slope (I don't have my map with me). read more
Any time except July 1 -- August 31, the"official" Mt Fuji climbing season. Mt Fuji is pretty empty the rest of the year. For much of the time outside the official season, Mt Fuji is dangerous if you are not skilled in snow and ice climbing. read more
At times the trail to the top of Fuji can be as crowded as a Tokyo subway station at rush hour, as David Guttenfelder’s photos here show. The number of climbers is expected to increase now that Mt. Fuji has been named a UNESCO World Heritage site, a status it earned in June. read more
(updated June 6, 2018) A: According to the official climbing statistics collected by the National Parks of Japan, the number of Mt. Fuji climbers reached an all-time record of 320,975 climbers in 2010, before the 2011 Great East Japan Earthquake & Tsunami. read more