When Does GREEN×EXPO 2027 Open? Dates, Hours, Countdown and How to Prepare
“So when does GREEN×EXPO 2027 actually start?” If you’ve started looking into Yokohama’s international horticultural expo, that’s usually the first thing you want pinned down. The short answer: it runs from Friday, March 19 to Sunday, September 26, 2027 — 192 days in all, stretching across half a year. This guide sets out the dates and the venue basics, covers what is (and isn’t) known about opening hours, and walks through what’s worth sorting out before the gates open. This is an unofficial summary, so check the official announcements before locking in your plans.
The dates: March 19 – September 26, 2027 (192 days)
GREEN×EXPO 2027 runs from Friday, March 19 to Sunday, September 26, 2027 — 192 days in total. The calendar moves through spring, early summer, high summer and early autumn, so the grounds look quite different depending on when you go.
Roughly by season, here are the general bloom guides often cited for Yokohama and the wider Kanto region:
- March–April (just after opening) — tulips (late March to April), nemophila (around April). Attention runs high, so weekends tend to be busy.
- May–June (early summer) — wisteria (late April to early May), roses (mid-May to June), hydrangeas (around June).
- July–August (high summer) — sunflowers (late July into August). This overlaps the school holidays, so families turn out in larger numbers.
- September (toward the close) — dahlias (late August into September), cosmos (around September).
Note: these are general seasonal guides. Exactly which flowers will be planted where, and when, is part of the official planting plan that hasn’t been announced yet. We keep the season-by-season highlights updated on the bloom calendar.
If you want to count down, the date to set your sights on is March 19, 2027. And when you’re deciding when to go, the most useful approach is to think about where in these 192 days your schedule and the flowers you want to see line up best.
Venue and key facts (Yokohama / Kamiseya, about 100 ha, the theme)
The expo takes place on the former Kamiseya Communications Facility site, which straddles Asahi and Seya wards in Yokohama. The expo zone covers about 100 hectares. This was once a US military communications base, and securing a single open stretch of land this size within Yokohama is something only this former site really made possible.
| Item | Details |
|---|---|
| Name | 2027 International Horticultural Exposition (GREEN×EXPO 2027) |
| Dates | March 19 – September 26, 2027 (192 days) |
| Location | Former Kamiseya Communications Facility site, Asahi / Seya Ward, Yokohama |
| Area | About 100 hectares (expo zone) |
| Theme | Scenery of the Future for Happiness |
| Classification | AIPH Class A1 (highest rank) / BIE recognized |
| Visitor target | 10 million paid visitors |
The theme is “Scenery of the Future for Happiness.” The thread running through the whole expo is thinking about the shape of future society through flowers, greenery and the relationship between people and nature. The central Theme Pavilion focuses on Nature-based Solutions (NbS) and the circular economy. The Japan Government Garden is among the largest spaces on site at about 2.5 hectares of exhibition area, with an immersive theater. A total of 70 countries and regions are taking part, though details of each country’s individual pavilion haven’t been announced yet — they’ll become clearer as the opening approaches (the latest is on the pavilion guide).
One thing worth knowing early: there is no station right next to the venue. The basic way in is a reservation-only shuttle bus from four stations — Seya, Mitsukyo, Tokaichiba and Minami-machida Grandberry Park. We’ve pulled the details together in the access guide.
What’s known about opening hours and evening entry (to be confirmed)
I’ll be straight about this: the daily opening hours — when the gates open and close — have not yet been confirmed or published.
What we do know is that the ticket lineup will include an evening pass. A ticket for entry from late afternoon onward suggests the grounds are planned to open into the evening, not just during the day. Even so, the exact price, eligible dates and entry hours for the evening pass are all still to be announced, so we can’t put specific times on it here.
- Regular hours — the specific opening and closing times are to be announced.
- Evening entry — an evening pass is planned, suggesting entry from late afternoon. Exact hours and dates are to be announced.
- Possible seasonal variation — over a six-month run, hours can shift by season. This isn’t confirmed either.
Opening hours shape when you should arrive and how late you can stay. We’ll reflect them here once they’re confirmed, so check the latest version before you set off. For how the ticket types work (including who the evening pass suits), see the ticket guide.
How to prepare before opening day (early-bird tickets, reservations, access)
Opening day is March 19, 2027. It may feel a way off, but going early pays. Here’s what to prepare, in priority order.
1. Lock in early-bird tickets (advance sales start March 19, 2026). The biggest win is the advance early-bird ticket: ¥4,900 for adults, ¥600 less than the same-day ticket after opening (¥5,500). Junior tickets are ¥3,000 vs ¥3,300, child ¥1,400 vs ¥1,500. Advance sales start on March 19, 2026. Tickets currently carry no fixed date, so even if you’re only half-decided, you can buy one early-bird ticket now and settle on the day later. If you plan to go many times, the season pass at ¥28,000 for adults pays off after roughly six visits versus same-day tickets. For how to choose, see the ticket guide.
2. Keep an eye on the date-and-time reservation system. While tickets currently have no fixed date, a system to set your entry date and time in advance is reportedly going to start. The process, scope and start date haven’t been confirmed. At the 2025 Osaka-Kansai Expo, date-and-time reservations were central to managing crowds — but Yokohama won’t necessarily run it the same way, so we won’t state that as fact here.
3. Decide how you’ll get there. Because there’s no station next to the venue, the earlier you settle your route, the less you’ll scramble. By train, it’s a reservation-only shuttle bus from the four stations. By car, the venue parking (about 5,900 spaces on the north side plus about 600 on the west) is also reservation-only, so it isn’t a turn-up-and-park setup; off-site park-and-ride is planned for the busiest periods. Reservation methods and start dates are still to be announced, so start with the overall picture in the access guide.
4. Get a sense of the busy and quiet periods. Official projections put a regular weekday at around 50,000 visitors a day, while a peak weekend or holiday is around 105,000 — more than double. The quieter windows are weekdays, especially Tuesday to Thursday, and the periods right after opening and in the late afternoon.
In priority order: (1) secure tickets with the advance-sale start (March 19, 2026) in mind → (2) follow updates on date-and-time reservations → (3) decide how you’ll get there → (4) get a feel for when to go. The first step, more than anything, is that early-bird ticket.
How to follow the latest updates on this site
The dates are fixed — March 19 to September 26, 2027 — but a lot of details are still taking shape, including opening hours, the date-and-time reservation process and the specifics of each country’s pavilion. On this site, we keep separate pages by topic and update them as news lands:
- Ticket types, prices and best value → the ticket guide, with current prices on the tickets page.
- Getting there, the 4-station shuttle, parking and airport routes → the access guide and the access page.
- Season-by-season flower highlights → the bloom calendar.
- The big picture of the expo itself → What is GREEN×EXPO 2027?
Anything marked “to be announced” — like opening hours and date-and-time reservations — will be reflected on the relevant page here as soon as official updates appear.
To start, pick the ticket that fits you in the ticket guide and work out your route in the access guide, with March 19, 2027 in your sights. For current ticket details see the tickets page, and for the full picture, What is GREEN×EXPO 2027?
This is an unofficial summary. Always confirm the final details of the dates, opening hours, reservations and tickets with official announcements.