Ultramarathons - 100KM & 50KM - Threshold Trail Series

Inclusive, Award-winning Ultras in Spectacular British Landscapes

Follow the Paths of Kings, from Ancient Coastlines to Sweeping Ridges

Follow in the footsteps of royalty along the spectacular Monarch’s Way and South Downs Way in this unique and inclusive figure-of-eight ultramarathon.

21st June 2025

West Dean Gardens

The South Downs

100km / 50km

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Have You Got What it Takes to Conquer the Oldest Path in Britain?

The UK’s biggest ultra is back for its 12th year. Conquer Britain’s oldest footpath as you race towards the 5000-year-old Avebury Standing Stones.

12th – 13th July 2025

Lewknor – Avebury

The Ridgeway

100km / 50km

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Five things to know before signing up to an ultramarathon:

Am I fit enough?

With the help of our friends over at Runna, we are confident that Ultras Are For All. Runna have provided training plans to suit all abilities. Click here to find a plan that works for you.
The routes?

Our 50km and 100km routes across both events promise to be rich in history and full of breath-taking scenery. Explore for yourself, to find your perfect route: Stones / King
Cut off times?

We strive to cater for all abilities on the event. As a guide, the minimum speed to complete your respective distance is approximately 4km/hr or 2.5mph in order to reach cut off times.
Do entries close?

The official closing date is midnight on Sunday 2 weeks prior to the event, however, the events can sell out which would result in registration closing earlier.
What’s included?

From training plans and first-class route support, to fully loaded pit stops and an amazing overnight experience, there is a lot included in your Entry Fee. Find out more here.