Countdown Expired!

Welcome to UMUK, UK’s only ultraman distance triathlon, established in 2011.

In 2017, UMUK changed hands and was re-designed to ensure athletes and their support crews experience something special and unique.

UMUK offers three exciting events (UMUK 515, UMUK 355 and UMUK Team Relay) in the heart of Snowdonia National Park in North Wales. Large portions of this spectacular national park are designated Sites of Special Scientific Interest, National Nature Reserves, Special Areas of Conservation or Special Protection Areas.

By competing in one of our events you will be racing in some of the most breathtaking places in the United Kingdom.

Our events are widely considered the toughest ultra-distance staged triathlons in the world due to the unpredictable weather and tough elevation profiles, with both long gradual and short but brutally steep climbs. Competing in a UMUK event is an enormous undertaking which requires a huge amount of dedication and determination.

Organisers will select and invite a limited number athletes on a first come, first served basis as the applications are received and following review of your entry form.

Please remember that all your experiences and abilities will be considered so do not hesitate to send your application.


UMUK events will be held between 5th and 7th September 2025. Applications for our events are now open!

UMUK 515

UMUK is a three-day staged triathlon over the traditional ultraman-distance of 515 km.

UMUK 355

UMUK 355 is a three-day ‘more than iron-distance but less than ultraman-distance’ staged triathlon of 355 km.

Team Relay

UMUK Team Relay is a three-day staged team triathlon over the traditional ultraman-distance of 515 km.

Behind the scenes

Meet the people who work hard to make UMUK events happen!.


Our Team

The team at Racing Quest share your passion

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Work with us

Are you interested in working at UMUK 2025?



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contact us



    17 Chaffinch Walk, Great Cambourne, Cambridge CB23 6BD.


    +44 7783 221379

    email /

    Racing Quest (UK) Limited
    Registered in England and Wales No: 10959675
    Registered Address: 17 Chaffinch Walk, Cambridge CB23 6BD

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