Hiratsuka, Kanagawa Pref., Japan · Monday, September 21, 2026

Timed 6 hours

Shonan Int. Relay Marathon 6 hour Run

18 days to go

not publishedn/a Distance

not publishedn/a Climbing

not publishedn/a Grit

We hold no course length for this race — a timed or backyard event is measured by the clock, not the kilometre — so there is no Grit score to give you.

35.3351° N, 139.3494° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~17 Tiny. You will run alone for most of it.

DUV results for the 2025 edition (6h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daytime high 26°C

Night low 18°C

Rainfall Wet — expect rain

Daylight 12 h 14 m of light

Regional 2001-2020 average for September — NASA POWER, grid elevation 233 m. Not a forecast.

The Aid Station

Course-specific beta from the community

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Gear for this race

Chosen for this trail race.

Trail Running Shoes Cushioning on trail that is still there in the last quarter.
Race Nutrition Self-supported fuelling between aid stations.
Hydration Vests Flask capacity without the bounce.
GPS Watches Battery life first — an ultra outlasts most full-GPS modes.