To go there, get on the bus bound for Haguro-Gassan (bus timetable) and get off at Gassan Hachigome 月山八合目. Gassan's official climbing season starts on July 1st and ends on September 15th (exceptionally shorter in 2021 due to coronavirus). The mountain is still hikeable until Early October, but we highly recommend not climbing the mountain later than this period due to dangers related to snow.