Registration

2027 Registration Process

Registration will be open to runners with a valid UTMB index only from September 22nd 2026, at 14:00 until September 24th , 2026, at 13:59.

At the end of this period, registrations will be open to runners with or without a valid UTMB index until July 21st 2027, at 00:00 or until the races are sold out.

There will be no waiting list.

EXPERIENCE:

To register for KAT100 by UTMB, for safety reasons, runners need to prove their experience. They will be aksed to have

• 100K (Endurance Trail): valid UTMB index in the categories 50K, 100K or 100M
• 100M (100 Miles): valid UTMB index in the categories 100K or 100M

Further information here

MINIMUM AGE:

Anyone born in 2009 or before may register to races 100 Miles, Endurance Trail, Marathon Trail, Speed Trail.

Anyone born in 2013 or before may register to race Easy Trail.

AGE CATEGORIES:

WHAT IS INCLUDED:

• Race Bib
• Access to aid stations
• Transport to the start line for Endurance Trail (with the shuttle)
• Transport of spare bags (depending on the distance)
• Medical assistance
• Participant gift (not included for Easy Trail; the participant can buy it additionally with the registration)
• After race services
• Finisher medal
• Finisher beret (for 100 Miles only)
• Pasta Party
• T-shirt

a) To another runner:

For security and control reasons, registration is nominal and non-transferable. Transfer of bibs between runners is not permitted.

b) To another distance of the same event:

It is possible to transfer a registration to a shorter distance until 3 weeks before the event (15th July 2027) and in the limit of places available. In this case, no refund will be made. The event organiser must be contacted directly via e-mail. It is also possible to ask to transfer a registration to a longer distance, but the request will not be automatically accepted and will be at the discretion of the race director. Transfers are only available if the new distance is not sold out. It is not possible to postpone the registration to the following year.

Withdrawal Conditions

Speed Trail and Easy Trail: The registration is not refundable.

100 Miles, Endurance Trail and Marathon Trail: Withdrawal requests must be received during the following time frames in order to be eligible for a partial refund:

Process for withdrawals:

To request your cancellation, enter into your Participant Dashboard on the Registration Platform and click on "Cancel my Registration". Our team will process your request and process the partial refund if it applies, according to the withdrawal conditions.

In order to give fair recognition to high level athletes and to ensure a fair management of entry applications, we reserve places for elite athletes according to their Performance Index in the category of the race they choose to compete. Elte runners must register during the registration period. No registration will be accepted after the deadline.

Once a distance is sold out, the event organiser has the right to refuse an elite registration.

All elites must register to a race at least 60 days before the race.

See the requirements to qualify as an elite athlete here >> (section: Elite Runner Registration Benefits)

Medical certificate is not required, but we recommend the runners to have regular medical check-ups, especially for those who are exposed to a greater physical load.

UTMB® strives to facilitate and encourage the participation of women in trail running races, and has therefore implemented a new policy concerning pregnancy which applies to all the events of the UTMB® World Series circuit.

FOR WHOM?

• Pregnant athletes
• Athletes with a pregnant partner
• Athletes who adopt or procreate through surrogacy

You can find all the information here. You can contact the organiser to benefit a deferral or refund depending on the conditions listed in the link above.

As part of UTMB's ongoing efforts to increase and encourage the participation of athletes with disabilities in trail running races, UTMB has implemented a new policy for all UTMB World Series events. Find it here >>

WHO IS ELIGIBLE FOR THE POLICY? This policy will apply to athletes in the adaptive athlete open division. Participation in the Adaptive Athlete Open Division is available to athletes with the following disabilities: • Visual Impairment • Intellectual Disability • Physical or Neurological Movement Disability

RUNNER-GUIDE POLICY: All adaptive athletes are allocated an extra bib number, free of charge, for a guide runner to accompany them on all or parts of their race.

PROCESS FOR ADAPTIVE ATHLETES:

1. Complete the Adaptive Athlete Open Application.
2. You will be contacted once your adaptive athlete status has been approved.
3. When you register to a new event, please directly contact the race organization with the confirmation of your adaptive athlete open approval.
4. If you require a runner-guide, please contact the race organization directly with the following information : the name and contact details of your chosen runner-guide. Please contact the organization as soon as you have registered.