2026 Lake Ashi Summer Festival Week: Kosui-sai Fireworks Festival — Full-Day Course
This course centers on the Kosui-sai Fireworks Festival, part of Lake Ashi Summer Festival Week, held on Friday, July 31, 2026, and lets you spend a full day taking in Hakone's nature and history. At midday, visit Hakone Shrine, known for its torii gate standing in the lake, then stroll through the lush Onshi-Hakone Park. In the afternoon, visit Hakone Checkpoint, which evokes the Edo period, before enjoying a stroll on Lake Ashi aboard a sightseeing boat. In the evening, secure a spot for the fireworks while having dinner on the Motohakone lakeshore, and at 8pm, about 5,000 fireworks launch from the surface of Lake Ashi, their light reflecting on the mountain-ringed lake to close out a summer night in Hakone.
Schedule
Visit the shrine known for its torii gate standing in the lake
Take in a sweeping view of Lake Ashi from the garden of a former imperial villa
Visit a historic site reconstructing an Edo-period checkpoint
Take a boat ride on the lake for sweeping views of Hakone's mountains
Have dinner by the lake while securing a spot for the fireworks
About 5,000 fireworks echo off the mountains and reflect on the lake
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