murmurLake Ashi Summer Festival Week (Kosuisai)
Hakone Town · Hakone Shrine and the shores of Lake Ashi (Motohakone, Hakone-en, Kojiri and Hakone bays)
Dates and details can change. Always check the official website before you go.
Kanagawa Prefecture Tourist Association · Last checked: Oct 11, 2026
Dates
Dates confirmed with official sources
- 2026
- Jul 31 – Aug 5, 2026 （Ended） Fireworks every night from 20:00
- 2027
- Dates have not been announced yet. Please check the official website.
- Usual timing
- Usually late July
- How the date is set
- Changes from year to year Six days from the Kosuisai lake festival to the Torii-yaki festival, announced each year by the Hakone Town Tourist Association and others
- Venue
- Hakone Shrine and the shores of Lake Ashi (Motohakone, Hakone-en, Kojiri and Hakone bays)
- City
- Hakone Town, Kanagawa
About
For 6 days each summer, Lake Ashi becomes the stage for a festival anchored by Hakone Shrine's grand annual rites. It begins with Kosuisai, the eve ceremony, in which the chief priest rows out alone in an offering boat to the middle of the lake and presents red rice to Kuzuryu, the dragon god who protects its waters. Over the next days come the main festival, a procession carrying the deity's palanquin across the lake, the Komagata Shrine festival and the Kojiri Dragon God festival at Kuzuryu Shrine. On the last night, Torii-yaki, a torii in the lake is lit with sacred fire, echoing a legend of villagers burning a gate to soothe the dragon. Every evening of the week, fireworks, including underwater ones, rise over Motohakone, Hakoneen, Kojiri and Hakone bays.
Sources
- OfficialKanagawa Prefecture Tourist Association www.kanagawa-kankou.or.jp
- OfficialHakone Town Tourist Association www.hakone.or.jp
Last checked: Oct 11, 2026. Event information is based on official announcements, but changes may not always be reflected here. Please check each official website for accurate details.
Other events this month
On the day, see what locals are murmuring on the murmur map
murmur is an app that shows short, anonymous posts on a map, right where they were written. On festival day, open the map around the venue and see what people nearby are saying.