The TU is a friendly boutique race in the beautiful, remote jungle, forest and hill tribes of north west Thailand. 

We ensure everyone has an amazing experience when they take on the challenge of one of Asia's toughest ultras.

The TU has a unique, friendly atmosphere before, during and after the race, and maintains the competitive edge by attracting some of the top names in world ultras.

There are two event distances:

The TU50 is The Beauty - a tough, mountainous 50km trail, but most athletes can finish, because of the generous cut off times.

The TU100 is The Beast - a very physically demanding 100km mountain ultra, that will test even the most legendary athletes!

Come and join us!


Timothy Olson - Winner of The Beast 2016

'What an incredible experience at the Thailand Ultramarathon. What a gnarly 100k course; the heat & humidity melted my face off, 16,000ft of climbing with another 16k of descent left the legs crushed and the technical terrain kept me always present. So many highlights that started with a sunrise with mountain peaks poking out of the inversion layer and capped off with a win and CR to  end this year of racing'  

 If you are a runner or a supporter, you will love this race. It is in the mountains of Mae Hong Son province, very close to the Burmese border.

This sparsely populated area is off the tourist track, and the route for the races heads into some very isolated areas.

This is a trail run with a difference; you will pass through several remote hill tribe villages, 2 wilderness sanctuaries, see awe-inspiring limestone cliffs, and the entrance to a cathedral-like river cave. There are also 700 year old burial mounds right next to the track. It’s in the magnificent rural back country of north west Thailand.

The course has been designed to maximise time spent under the jungle canopy, on ancient hill tribe trails, and on disused dirt roads.

This is Thailand’s first mountain ultramarathon, and it’s tough, so be prepared for some big hill climbs and steep descents.


Entries for The Beauty and The Beast will open in 2018. 

Entries will be limited to:

TU50 200 runners

TU100 100 runners

Are you tough enough to do both?


When is the TU

TU50 - NOVEMBER 2018 

TU100 - NOVEMBER 2018



mailing list

If you would like get our newsletter, sign up to our mailing list 🙂 We only send out a couple of newsletters a year to let you know the important stuff!