EVENT

Koto City Festival

Tokyo Sea Forest Halloween 2026

A Halloween event where you walk through Tokyo’s forest solving mysteries
「TOKYO 海の森 HALLOWEEN 2026」

At the Tokyo Metropolitan Umi-no-Mori Park in Koto City, Tokyo, over two days on October 31, 2026 (Sat) and November 1 (Sun), the family-friendly hands-on event 「TOKYO 海の森 HALLOWEEN 2026」 will be held.
This event lets you solve puzzles while walking through a vast forest and learn about the origins of Tokyo Metropolitan Umi-no-Mori Park. A dining area with food trucks, Halloween decorations, and photo spots will also be available.

Event Highlights

Mystery-solving adventure through the forest

With a puzzle-solving kit in hand, visit six locations in the park to collect clues and unravel the story. The experience takes about 1 hour 45 minutes, with a difficulty level suitable for children aged 9–10 to enjoy together with their guardians.

Umi-no-Mori was created on land that once served as a landfill, where about 240,000 trees were planted. While learning about its history, parents and children can take on the puzzle challenge together.

Enjoy meals from food trucks

A dining area with food trucks will be set up at the venue. Relax on the lawn and enjoy mainly handheld bites.

Halloween decorations and photo spots

Various areas of the park will be adorned with Halloween decorations, and photo spots for families to enjoy will be provided. Guests in costume are welcome, so you can fully enjoy the Halloween atmosphere.

Recommended for

Recommended for those looking for a Halloween event that parents and children can enjoy together, or for those who want to take on a puzzle-solving challenge in nature.
Enjoy two days of walking through Tokyo’s vast forest while savoring puzzle-solving, gourmet food, and photography. Why not spend a special Halloween this autumn with family and friends at Tokyo Metropolitan Sea Forest Park?

  • ※ The event will be held in case of rain; canceled in severe weather.
  • ※ Admission is free, but there is a fee to participate in the puzzle-solving.
  • ※ The puzzle-solving kit can be purchased at the sales booth inside the venue on the day. No advance sales.
  • ※ A paid shuttle bus is scheduled to operate from in front of Tokyo Teleport Station. Please check the official website for details such as the timetable and fares.
Period 2026.10.31–11.01
Time 10:00~17:00
Location Tokyo Metropolitan Sea Forest Park
Address 〒135-0066 東京都江東区海の森三丁目地内
Participation Fee Free admission
Puzzle-solving kit: Adults 3,000 yen; Children 1,500 yen; Preschoolers free (no kit)
Contact SE Entertainment Co., Ltd.
"TOKYO Sea Forest HALLOWEEN 2026 Secretariat"
info@se-entertainment.jp
Related Website https://tokyo-uminomori-halloween.jp/

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