The climbing season is July to September when trails are snow-free. July and August have the warmest weather and longest daylight. September offers cooler temperatures and autumn colors. Winter climbing from December to April requires advanced mountaineering skills, avalanche equipment, and winter gear.
The Hirafu Trail has a 1,700-meter elevation gain over 6 kilometers. Ascent takes 5 to 7 hours and descent takes 3 to 4 hours. The trail includes steep sections and loose volcanic scree near the summit. Good physical fitness and previous mountain hiking experience are required.
No permit or fee is required. Climbers must sign the registration box at the trailhead. Guides are optional but recommended for inexperienced hikers. Local guide services operate from Niseko.
There are no huts, shelters, or water sources on the mountain. Toilets are available only at trailheads. Climbers must carry all food, water, and supplies. Accommodations are in Niseko or Kutchan town.
Seeing Mount Fuji is extremely rare and requires perfect visibility across 830 kilometers. The summit reliably offers views of Lake Toya, the Niseko range, and the Sea of Japan. The summit crater contains a small pond.