Lake Kawaguchi · Summer Festival
On Wednesday 5 August 2026, Lake Kawaguchi holds the Kojosai (湖上祭) — the “festival on the lake” held since 1917, now past its 100th edition and the biggest fireworks night in the lake region, with roughly 10,000 shells fired from the water and Yagizaki Park. In 2026 it also serves as the finale of four straight nights of fireworks across four of the Fuji Five Lakes (2–5 August). And this year it comes with an unusual detail: Fujikawaguchiko Town is crowdfunding ¥10 million to keep these traditions alive against surging fireworks and security costs. Here’s the practical guide — launch sites, viewing spots, road closures — and how the funding side works.
What is the Kawaguchiko Kojosai?
The Kojosai is Lake Kawaguchi’s summer festival, traditionally held on 5 August, with fireworks launched over the water and from Yagizaki Park on the southern shore. It dates back to 1917 — more than 100 editions across its century-plus history — and it’s the largest of the summer festivals held across the Fuji Five Lakes. Expect big single shells, wide starmines and “musical fireworks” sequences set to soundtracks, all doubled in the lake’s reflection, with festival stalls lining the lakeside from Oike Park toward the Kogyoku Tunnel.
What makes it special isn’t just scale. Where the mega-festivals near Tokyo have grown gates and ticket tiers, the Kojosai lists no paid seating at all — a town festival at heart, with free lakeside viewing that draws around 120,000 people, food stalls, and on a clear evening a Mt. Fuji backdrop from some vantage points. If you’ve read my breakdown of where Japan’s fireworks festivals are heading on paid seating, this is the other end of that spectrum.
2026 practical details
| Item | 2026 details |
|---|---|
| Date | Wednesday 5 August 2026 (evening) |
| Launch sites | Over Lake Kawaguchi + Yagizaki Park |
| Official viewing areas | Funatsuhama beach, Hirahama parking area, Oike Park |
| Stalls | Along the lakeside from Oike Park toward the Kogyoku Tunnel |
| Road closures | 17:00–21:30 — pedestrian-only streets and no-entry zones centred on the Funatsu and Asakawa lakeside districts |
| Access | Fujikyu line to Kawaguchiko Station, then ~15 min on foot to the viewing areas — public transport strongly recommended |
Driving? Think twice on this one. Road restrictions centre on the Funatsu and Asakawa lakeside districts from 17:00, so getting a car close to the venue in the evening will be difficult — the town itself recommends public transport. The simplest plan of all is sleeping in Kawaguchiko that night, with your bed a walk from the fireworks. If you go that route: lakeside hotels · ryokan on Rakuten Travel (affiliate links).
Four lakes, four nights: the full 2026 series
The Kojosai is the finale of a four-night run of traditional fireworks across the Fuji Five Lakes, all organised within Fujikawaguchiko Town:
| Date | Lake | Festival | Official description, in short |
|---|---|---|---|
| Sun 2 Aug | Lake Saiko | Ryugusai (竜宮祭) | Lantern floating and fireworks in thanks to the mountain and lake deities |
| Mon 3 Aug | Lake Motosu | Shinkosai (神湖祭) | Fireworks over the deepest, clearest of the Five Lakes |
| Tue 4 Aug | Lake Shoji | Ryokosai (涼湖祭) | The smallest and most intimate of the four — fireworks at close range in an at-home atmosphere |
| Wed 5 Aug | Lake Kawaguchi | Kojosai (湖上祭) | The headliner: giant starmines and musical fireworks over the lake |
The connoisseur’s move: the small nights are where this series quietly shines. Shoji’s Ryokosai on 4 August is officially billed as the intimate one — close-range fireworks in an at-home atmosphere, with crowds nothing like Kawaguchiko’s. Stay in the area and you can collect two or three lakes in one trip. I’ve now written a dedicated guide to the three quiet nights — exact times, the no-bus-home trap, and which lakeshore actually faces Fuji.
The crowdfunding keeping these festivals alive
This year’s series carries a message the town has made explicit: these festivals are getting hard to pay for. Fujikawaguchiko Town is running a government crowdfunding (GCF) campaign on Furusato Choice titled “Colour the summer Fuji and four lakes with fireworks” — target ¥10,000,000, open 29 May to 26 August 2026. The stated reason: sharp cost increases in the fireworks themselves and in the security staffing that safe operation now requires.
If that sounds familiar, it’s the same cost squeeze pushing paid seats and premium tiers at festivals nationwide. Fujikawaguchiko’s answer, so far, is to ask for support rather than gate the lakeshore, which is exactly why a night like the Kojosai still feels the way it does.
How it works
The campaign runs on Furusato Choice’s GCF platform under Japan’s hometown-tax scheme. Donations fund the four lake festivals’ operation and safety costs, with local specialty goods and tourism coupons among the return gifts.
For Japanese taxpayers
Donors who pay Japanese resident/income tax and meet the usual furusato nozei conditions can claim the standard deductions.
For visitors
The tax benefit is built for Japanese taxpayers — for anyone else, treat a contribution as a straightforward donation. And even without donating, spending locally at the festival — stalls, shops, a night’s stay — is practical support the town feels directly.
Making a trip of it
The Kojosai lands in the heart of the lake’s summer: the new Oishi Park ferry route makes the north-shore flower gardens an easy pre-fireworks afternoon, and my Japan in August calendar shows how the four-lake series slots into the country’s busiest festival week — Nagaoka fires its giants on 2–3 August the same week. Come hungry: between the stalls and the lakeside bakeries and teishoku shops, this is a good town to graze through before dark.
Kawaguchiko Kojosai — FAQ
When is the Kawaguchiko Kojosai fireworks festival in 2026?
Wednesday 5 August 2026, in the evening, with fireworks launched over Lake Kawaguchi and from Yagizaki Park. Road closures around the Funatsu and Asakawa lakeside districts run 17:00–21:30.
Where is the best place to watch the Kojosai fireworks?
The official viewing areas are Funatsuhama beach, the Hirahama parking area and Oike Park. With road restrictions starting at 17:00 and around 120,000 visitors in a typical year, arriving early — ideally by public transport — matters more than which of the three you pick.
Is the Kawaguchiko Kojosai free to attend?
Yes — no paid seating is listed for the Kojosai, and the lakeside viewing areas are free, in contrast to the ticket-heavy direction many big-city festivals have taken. Festival stalls line the lakeside from Oike Park toward the Kogyoku Tunnel.
How do I get to the Kojosai without a car?
Take the Fujikyu line to Kawaguchiko Station; the viewing areas are about 15 minutes on foot. The town explicitly recommends public transport, since streets around the venue close to cars from 17:00.
What are the other Fuji Five Lakes fireworks festivals in August 2026?
Four nights run in a row: Lake Saiko’s Ryugusai on 2 August (with lantern floating), Lake Motosu’s Shinkosai on 3 August, Lake Shoji’s small and intimate Ryokosai on 4 August, and the Kojosai finale at Lake Kawaguchi on 5 August.
What is the Kojosai crowdfunding campaign?
Fujikawaguchiko Town is raising ¥10 million on Furusato Choice’s government crowdfunding platform (29 May–26 August 2026) to cover the rising fireworks and security costs of its four lake festivals. Donations follow Japan’s hometown-tax scheme, with tax deductions for Japanese taxpayers and local goods among the return gifts.
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