Shonan International Marathon
2026 at a glance
- Entry closed
- Race day
- ResultsAfter race day
- Race day
- Dec 6, 2026 Sunday
- Distance
- 26.2 mi Marathon · 42.2 km
- Entry
- Closed
- Latest results
- 2025
Quick facts
- Carry a bottle with at least 200 ml of water to start; no disposable cups on course
- 6 hour 30 minute finish limit with intermediate cutoffs
- Two out-and-back legs along the Shonan shoreline
- Entry is first come, first served and closes once full
Course
The marathon starts on the Seisho Bypass at Oiso-nishi IC and heads east along the shore through Hiratsuka and Chigasaki to a turnaround near the Enoshima entrance. It returns west to a second turnaround at Nishi-Shonan Ninomiya IC before finishing at the Oiso Prince Hotel. Most of the route follows seaside roads, so wind off the water is the main variable.
Race-day weather
Early December on the Shonan coast is usually cool and bright, good marathon weather, but an exposed shoreline means a headwind on one leg of each out and back is likely.
About the race
Shonan International Marathon is a large coastal race southwest of Tokyo, finishing at the Oiso Prince Hotel. It bills itself as the first marathon to send out zero disposable cups or plastic bottles on course, so marathoners start with their own filled bottle. More than 17,000 started the 2025 marathon and 93% finished.
Dates and results by year
FAQ
When is the Shonan International Marathon?
The 2026 Shonan International Marathon is on Sunday, December 6, 2026.
Is registration open for the 2026 Shonan International Marathon?
Entry for the 2026 Shonan International Marathon is closed, as of Nov 13, 2026. Entry details: shonan-kokusai.jp.
Where can I find the Shonan International Marathon results?
The 2025 results and earlier years are on the results page.
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