The Early Years
2007Established in 2007, the Tokyo Bay Half Marathon is now 19 years old. From its first edition in Tokyo, it has evolved into a race that reflects the character of its host region in Japan.
東京ベイ半マラソン
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12 apr 2026
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The Tokyo Bay Half Marathon features a scenic waterfront course that showcases the city's modern skyline and iconic landmarks including the Rainbow Bridge. Runners navigate through Odaiba and coastal Tokyo areas with excellent support stations and minimal elevation changes, making it ideal for fast times.
Early December in Tokyo typically offers cool, pleasant running conditions with moderate humidity. Clear skies are common with occasional rain showers.

The Race

Tokyo
Established in 2007, the Tokyo Bay Half Marathon is now 19 years old. From its first edition in Tokyo, it has evolved into a race that reflects the character of its host region in Japan.
The fastest time ever recorded at the Tokyo Bay Half Marathon is 01:01:18, set by Yuya Harashima in 2022. Every year, new contenders line up hoping to challenge that mark on the streets of Tokyo.
Runners come to the Tokyo Bay Half Marathon for one reason: personal bests. The flat, fast course through Tokyo has a reputation as a PB factory, with the roads seemingly designed to keep your pace honest and your splits consistent from start to finish.
For thousands of runners each year, the Tokyo Bay Half Marathon is their first half marathon. The combination of a forgiving course, generous time limits, and supportive crowds has earned this race a reputation as the place where marathon journeys begin. The first-timer energy on race morning is palpable.
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01:01:18
Yuya Harashima (2022)
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