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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【September 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【September 1month 100km】)
Start: 2026-09-01
End: 2026-09-01

Gunma, Japan

calendar_today 01 Sep, 2026

directions_run Running

language Official Website

About the Event

Immerse yourself in the spirit of Japan's pioneering ultra-marathon, the Saurama Lake 100km Ultra Marathon. This virtual race allows you to experience the legendary course from your own home and strive for that elusive finish line just as runners have done on the shores of scenic Lake Saroma.
The event offers a taste of one of the most respected ultra-distance races in Japan, where participants challenge themselves against 100 kilometers of diverse terrain. Whether you're an experienced ultramarathon runner or aspire to tackle this iconic route someday, this online edition provides an accessible way to engage with its rich history and demanding course.
Choose from various entry fees ranging from ¥4,990 to ¥12,990, each offering unique benefits that enhance your virtual race experience. Join the community of runners who share a passion for pushing their limits in one of Japan's most revered races.
Experience the thrill of running alongside Lake Saroma without leaving your doorstep and connect with fellow enthusiasts as you prepare to take on this monumental challenge at your own pace and convenience.

Races Offered

2 Month 100km Stage 1 (November-December)

Sep 01, 2026

straighten

Distance — 100K

terrain

Type — Running

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21 days remaining

2 Month 100km Stage 2 (November-December)

Sep 01, 2026

straighten

Distance — 100K

terrain

Type — Running

timer

21 days remaining

November 1month 100km

Sep 01, 2026

straighten

Distance — 100K

terrain

Type — Running

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21 days remaining

October 1month 100km

Sep 01, 2026

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Distance — 100K

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Type — Running

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21 days remaining

September 1month 100km

Sep 01, 2026

straighten

Distance — 100K

terrain

Type — Running

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21 days remaining

Year end 1month 100km

Sep 01, 2026

straighten

Distance — 100K

terrain

Type — Running

timer

21 days remaining

Weather History

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

thermostat Temperature

16.7° / 23.6°

wb_sunny Feels like

17.9° / 25.0°

light_mode Avg sunshine hours

8h 44m

water_drop Avg rainfall

5.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

4.7 km/h (Light breeze)

opacity Sweat loss rate

High

terrain Course conditions

Hard and dry surface

sunny Max UV Index

Moderate (5.0)

humidity_mid Humidity

86.6%

wb_twilight Sunrise

05:25

nightlight Sunset

17:50

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【September 1month 100km】).

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