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.
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Course & Elevation
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.
Surface: road Profile: Flat
Weather
Temperature 16°C
Humidity 55%
Rain Chance 30%
Early December in Tokyo typically offers cool, pleasant running conditions with moderate humidity. Clear skies are common with occasional rain showers.
The Race
Tokyo
Race Lore
The Course Record
2022The 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.
The Fast Lane
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.
Where It Begins
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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Course Record
01:01:18
Yuya Harashima (2022)
Registration
Registration Opens August
Registration Closes October
Entry Cost ¥8,000-¥10,000
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Fun Facts
- ▸ The race is part of the prestigious Tokyo Marathon Series and attracts elite Japanese runners alongside international participants.
- ▸ The iconic Rainbow Bridge is featured prominently in the course, offering spectacular photo opportunities with Tokyo's skyline in the background.
- ▸ December races in Tokyo are considered ideal training opportunities for spring marathons due to the cool, stable weather conditions.
- ▸ The event has grown from 3,000 finishers in 2007 to nearly 10,000 entrants, making it one of Japan's most popular half-marathons.
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