Mt. Fuji Triathlon Traffic Restrictions 2026: Lake Kawaguchiko and Saiko on September 6

Travel News Watch

Information checked: August 17, 2026, 8:31 AM JST.

The official Mt. Fuji Triathlon map shows full vehicle closures on sections of the Lake Kawaguchiko and Lake Saiko course on Sunday, September 6. The race itself is scheduled from 7:50 AM to 1:00 PM, while some road controls begin earlier and finish later.

Short answerAvoid driving into the Lake Saiko and south/north Lake Kawaguchiko course area on the morning of September 6. Depending on the road section, full closures run between approximately 7:35 AM and 1:35 PM, and the organizer specifically asks visitors not to enter the Lake Saiko area because detouring may be difficult.

Key Facts For Travelers

Affected areaLake Kawaguchiko and Lake Saiko course roads, including approaches near Yagizaki Park, Nagahama, Katsuyama, and the north shore of Lake Kawaguchiko.

Event dateSunday, September 6, 2026.

Race windowThe official map lists the race from 7:50 AM to 1:00 PM.

Road-control windowTimes differ by segment; the earliest listed closure begins at 7:35 AM and the latest listed section ends at 1:35 PM.

These Are Full Closures, Not Rolling Delays

The colored bike and running-course roads on the official map are marked as complete vehicle closures. The Lake Saiko bike-course sections are generally controlled until late morning, while the Lake Kawaguchiko running-course sections continue into early afternoon.

Only the colored roads shown on the official map are restricted. Other roads remain open, and the map says the Wakakusa, Kawaguchiko, and Arakura-Kawaguchiko tunnels remain available for travel to and from Kofu and Fujiyoshida.

Lake Saiko Is the Hardest Area for a Last-Minute Detour

The English traffic notice asks drivers not to enter the Lake Saiko area during the restriction period. Vehicles already inside may be unable to move even when parked away from the race route because the available exits connect to controlled roads.

Travelers staying around Saiko, Iyashi-no-Sato Nenba, or the cave area should ask their accommodation or transport operator about morning access before race day. Do not rely on a navigation app to understand temporary police controls.

Traveler Actions

Move Lake Saiko driving plans to the afternoon or another day if possible.
Save the official English traffic map and check the exact closure color and time for every road you need.
Allow a large buffer for buses, taxis, and private vehicles around Kawaguchiko Station and the lake roads.
Follow police and authorized staff instructions even if a navigation app suggests the closed route.
If your accommodation is inside the course area, confirm arrival, departure, and parking access directly before September 6.

Official Sources

Update History

August 17, 2026: Created from the official 2026 traffic page and English map, including the September 6 race window, segment-specific full closures, Lake Saiko warning, and available tunnel routes.