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Saroma Lake 100km Ultramarathon Online Challenge (サロマ湖100kmウルトラマラソンオンラインチャレンジ【October 1month 100km】)

Name: Saroma Lake 100km Ultramarathon Online Challenge (サロマ湖100kmウルトラマラソン オンラインチャレンジ【October 1month 100km】)
Start: 2026-10-01
End: 2026-10-01

Gunma, Japan

calendar_today 01 Oct, 2026

directions_run Running

language Official Website

About the Event

Immerse yourself in the rich tradition of Japanese ultra-marathons by taking part in an online version of the iconic Saroma Lake 100km Ultra Marathon. This virtual race invites runners from around the world to experience what it's like to tackle one of Japan’s most revered ultramarathon courses, whether you've run Saroma before or have long dreamed of doing so.
Choose your preferred entry level—ranging from ¥4,990 to ¥12,990—and embark on a journey that mirrors the challenging and scenic 100km route around Lake Saroma. Participants will navigate through varied terrain, including rugged trails and picturesque coastlines, all while enjoying the freedom of completing this epic distance at their own pace from anywhere in the world.
Join us to feel the spirit of one of Japan’s pioneering ultra-marathons without leaving your doorstep.
Experience the endurance challenge that has captivated runners for years. The virtual race offers a unique opportunity to connect with fellow enthusiasts and honor the legacy of this legendary event, all while pushing your own limits in the comfort and safety of your chosen environment.

Races Offered

2 Month 100km Stage 1 (November-December)

Oct 01, 2026

straighten

Distance — 100K

terrain

Type — Running

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43 days remaining

2 Month 100km Stage 2 (November-December)

Oct 01, 2026

straighten

Distance — 100K

terrain

Type — Running

timer

43 days remaining

November 1month 100km

Oct 01, 2026

straighten

Distance — 100K

terrain

Type — Running

timer

43 days remaining

October 1month 100km

Oct 01, 2026

straighten

Distance — 100K

terrain

Type — Running

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43 days remaining

September 1month 100km

Oct 01, 2026

straighten

Distance — 100K

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Type — Running

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43 days remaining

Year end 1month 100km

Oct 01, 2026

straighten

Distance — 100K

terrain

Type — Running

timer

43 days remaining

Weather History

These values represent the 3-year monthly averages for October in .

thermostat Temperature

9.0° / 16.5°

wb_sunny Feels like

7.4° / 15.3°

light_mode Avg sunshine hours

7h 46m

water_drop Avg rainfall

4.0 mm

ac_unit Avg snowfall

—

air Avg wind speed

6.1 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.0)

humidity_mid Humidity

82.2%

wb_twilight Sunrise

05:50

nightlight Sunset

17:06

Hotels & Places to Stay

Runner Reviews

Read what other athletes have to say about their experience at the Saroma Lake 100km Ultramarathon Online Challenge (サロマ湖100kmウルトラマラソンオンラインチャレンジ【October 1month 100km】).

★ ★ ★ ★ ★