Distance
Cutoff
Terrain
The race starts from the Toyosu district of Koto ward in eastern Tokyo, around Koto City Office on Yotsume-dori Avenue, and covers 30 km on firm city roads. It is built as a training race rather than a championship: a long sustained effort that lets runners rehearse marathon pacing, fuelling and race-day routine without the recovery cost of a full marathon. Early October in Koto is mild but humid, with daytime highs near 22.6°C, so the ground is usually firm with a slightly soft top. Entry is handled through the Runnet platform, and the field is a mix of local club runners and visitors using the race as a stepping stone to an autumn marathon.
Start area in the Toyosu district of Koto ward
Long 30 km effort on firm city roads
Timed to sit inside an autumn marathon training block
Start / Finish
Koto City Office area, Yotsume-dori Avenue, Toyo 4, Koto, Tokyo
Route
Getting There
Race Day
What you get
On the day
Before you enter
Other questions
Yes. There is no qualifying standard and no lottery mentioned for this race, so anyone who completes the Runnet entry can line up. Race communications are likely to be in Japanese, so check the official 30K Series website before you travel so you do not miss any notices about the start area or schedule.
No. No qualifying time, club membership or previous race result is required, and entry is open to any runner who wants to take on the 30 km.
That is exactly what the organisers have in mind. The distance is long enough to test marathon pace, nutrition and clothing choices without the full recovery cost of 42 km, which makes it a good fit for a long, controlled effort inside an autumn marathon block.
Three-year averages for October give daytime highs of about 22.6°C and overnight lows near 15.5°C, with around 6 hours 54 minutes of sunshine a day and only about 4.3 mm of rain. Humidity sits around 77 percent and the UV index is moderate. Sunrise is around 05:47 and sunset around 17:04, so the race is run entirely in daylight.
October conditions in Koto are typically firm with a slightly soft top, a surface that is quick but a little forgiving. That reading is a seasonal average rather than a forecast, so expect the ground to change if there has been recent rain.
Entry fee
Registration isn't open yet. We'll show pricing when the organiser confirms.Koto, Japan
Expected October 2027
Provisional date, around Oct 2Are you the organiser of Tokyo 30K Autumn (東京30K秋)?
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