Name: Bielersee Ultra-Marathon
Start: 2026-05-13
End: 2026-05-16
Location: Biel/Bienne

About the Event

Challenge the extraordinary at the Ultra Bielersee Läufe from May 13-16, 2026. This festival of endurance features Switzerland's only flat 50km ultra, a unique journey around Lake Biel that includes a special detour to the idyllic St. Petersinsel. For the ultimate test, the Bielersee XXL dares you to go beyond 100km with 120km, 160km, or a monumental 200km multi-loop challenge, while the 72-hour race pushes the boundaries of multi-day running. With inclusive options like a 40km walk, a team relay, and a Hagneckkanal half-marathon, the event creates a vibrant community for every level of athlete. The Ultra Bielersee is where personal limits are redefined against the stunning, serene backdrop of one of Switzerland's most beautiful lakes.

Races Offered

Bielersee 72h

May 13, 2026

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Distance — Bielersee 72h

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Type — Road running

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133 days remaining

Bielersee XXL 120 km

May 15, 2026

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Distance — 120K

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Type — Road running

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133 days remaining

Bielersee XXL 160 Meilen

May 15, 2026

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Distance — 257.5K

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Type — Road running

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133 days remaining

Bielersee XXL 200 km

May 15, 2026

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Distance — 200K

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Type — Road running

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133 days remaining

Bielersee Light 40 km Walking

May 16, 2026

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Distance — 40K

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Type — Road running

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133 days remaining

Bielersee-Stafette

May 16, 2026

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Distance — 50K

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Type — Road running

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133 days remaining

Hagneckkanal Halbmarathon

May 16, 2026

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Distance — 21.1K

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Type — Road running

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133 days remaining

Ultra Bielersee 50 km

May 16, 2026

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Distance — 50K

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Type — Road running

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133 days remaining

Weather Overview

These values represent the 3-year monthly averages for May in Biel/Bienne.

Temp (°C)

Feels Like (°C)

thermostat 10.1° / 19.3°

wb_sunny 8.5° / 17.8°

Wind (km/h)

Humidity (%)

air 7.2 /

water_drop 74.9%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 10.1° / 19.3°

wb_sunny 8.5° / 17.8°

air 7.2 km/h

water_drop 74.9%

About Biel/Bienne

Biel/Bienne is a bilingual city in the canton of Bern in Switzerland. With over 55,000 residents, it is the country's tenth-largest city by population. The Biel urban area has a population of around 100,000 inhabitants. Biel/Bienne is the capital of the Biel/Bienne administrative district. The city has been an industrial and watchmaking heart of Switzerland since the 19th century. With world-famous watch brands such as Rolex, Omega and Swatch based in Biel/Bienne, the city is one of the main centres of the Swiss watch industry and is also referred to as the "world capital of watchmaking".