Registration

• Race bib
• Race shirt
• Personal collapsible cup
• Access to aid stations
• Final and intermediate timing
• Medical assistance
• Finisher medals for 21K and 50K; Special finisher gift for the 100K; Belt Buckle for 100M
• 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 Aug. 24, 2027. To submit a deferral request, please email us at grindstone@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 100M, 100k and 50k, and 16 years old to participate in the 21k.
• There is NO RACE DAY REGISTRATION.
• Online Registration Closes: Sunday, September 19, 2027, at 11:59 pm PST or until the races are sold out.
• We will take onsite registrations at the expo for any open distances.
• 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 the event expo when picking up your bib. There are no distance changes on race day.
• Reference the REGISTRATION FEE section on this page for the withdrawal policy.
• For questions, please reach out to grindstone@service.byutmb.world.

Grindstone Running Festival 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 100M distance, the 100K, and the 50K at Grindstone Running Festival gain automatic qualification to the UTMB, CCC, or OCC races, respectively.

All finishers of the Grindstone Running Festival 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.

UTMB 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: