Register

• Race bib
• Race shirt
• Personal collapsible cup
• Access to aid stations
• Final and intermediate timing
• Medical assistance
• Finisher medal
• Post-race food

Withdrawal Information: This registration is non-refundable and non-transferable. All paid entries are eligible for a one-time, for-any-reason deferral to next year’s event. All deferral requests will be honored until April 16, 2026. To submit a deferral request, please email us at rothrock@service.byutmb.world.

• Runners who register within 50 days prior to race day will not have race materials personalized (name on merchandise apparel and name on race bib).
• Runners must be at least 18 years old to participate in the 50K, and 16 years old to participate in the 25K.
• Online Registration Closes: Sunday, May 10, 2026, at 11:59 pm PT OR until the races are sold out.
• Once online registration closes, we will only accept onsite registrations for events that are not sold out; this must be done in person at (BASECAMP) expo. There is NO RACE DAY REGISTRATION!
• Distance changes are subject to availability. Please reach out to the event inbox to inquire.
• Distance change requests can be made via email up to 45 days prior to the event. After the 45-day deadline, all distance changes must be completed at BASECAMP (expo) when picking up your bib. There are no distance changes on race day!
• Reference the REGISTRATION INCLUDES section on this page for the withdrawal policy.
• For questions, please reach out to rothrock@service.byutmb.world.

Rothrock by UTMB is the start towards your quest to the UTMB World Series Finals in Chamonix, the mythic HOKA UTMB Mont-Blanc, the holy grail of trail running in the heart of the Alps, set on the three key distances: OCC (50K), CCC® (100K) and UTMB® (100M), the pinnacle trail running event.

As a UTMB World Series Event, the Top 3 female and Top 3 male runners of the 50k at Pacific Trails gain automatic qualification to the OCC.

All finishers of the Rothrock by UTMB collect Running Stones that can be applied to the HOKA UTMB Mont-Blanc draw. To be eligible for the lottery, runners need to have a least one Running Stone and a valid UTMB Index.

The UTMB World Series strongly believes in equal rights and opportunities for all members of the trail-running community. We are in the process of building inclusion and diversity policies on gender, race, age, social class and more. We endeavour to grow and continue to evolve the sport and to make UTMB World Series welcoming for each athlete.

You will automatically receive a confirmation email upon completing your registration.

Your age group category for the event you registered for will be reflective of your age as of December 31 of the event year.

Your name, and the names of other starters, is searchable via The Runner Start List or on UTMB Live prior to your race.

Online registrations are synced to our database within 24 hours. You can login to check your registration status, below: