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Fuji is divided into 10 concentric ‘stations’ from base (first station) to summit (10th), but most climbers start halfway up at various fifth station points, reachable by road. The most popular climbing route is the Yoshida Trail, because buses run directly from Shinjuku Station to the trailhead at the Fuji Subaru Line Fifth Station (sometimes called the Kawaguchi-ko Fifth Station or just Mt Fuji Fifth Station) and because it has the most huts (with food, water and toilets).
Official climbing season is 1 July to 31 August, but in recent years this has been extended to 10 September.
For the Yoshida Trail, allow five to six hours to reach the top and about three hours to descend, plus 1½ hours for circling the crater at the top. The other three routes up the mountain are the Subashiri, Gotemba and Fujinomiya trails; the steepest, Gotemba, is the most convenient to reach for travellers coming from Kansai-area destinations such as Kyoto and Osaka.
Trails below the fifth stations are now used mainly as short hiking routes, but you might consider the challenging but rewarding 19km hike from base to summit on the historic Old Yoshidaguchi Trail, which starts at Fuji Sengen-jinja in the town of Fuji-Yoshida and joins up with the Yoshida Trail.