The Opening of Mount Sumon (Otake) is an event held annually on the fourth Sunday of May, offering an excellent opportunity to enjoy the natural beauty of Niigata Prefecture during the mountain opening season. The main peak, Mount Sumon, which consists of three mountains, becomes adorned with beautiful flowers such as Manchurian ash, kobushi magnolia, and Showaera during spring. The event begins at the Tochihori and Iriichi River trailheads in Nagaoka City and attracts many participants aiming for Mount Sumon. It can be reached in about an hour from the Kanetsu or Hokuriku Expressways. This mountain opening features a hiking experience where you can directly feel the breath of nature, with views from the summit being truly worth seeing. Additionally, local community events and foods will surely be a delight. As limited-time perks, a market where you can purchase local specialties is a must-visit. Fresh vegetables and unique processed products are available. Visitors are recommended to start their hike early in the morning. Experiencing the moment the morning light illuminates the mountain is the highlight of this event. Enjoy the joy of becoming one with nature along with a pleasant fatigue.