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Registration

ENTRY RULES

Registration opens on June 20, 2025, at 10:00 AM (GMT+7) on the official website: https://chiangmai.utmb.world . There will be no pre-registration or lottery. For the first 48 hours, priority registration will be given exclusively to valid UTMB Index Holders.

After this 48-hour priority period, registration will open to all runners. Registration will remain open until October 31, 2025, at 10:00 AM (GMT+7), or until all race slots are filled, whichever comes first.

Only applicants who purchase the "Cancellation Guarantee" service will be eligible to request a cancellation. However, the reason for cancellation must align with the specified terms.

Applicants can request to change their race distance (increase/decrease) or transfer their registration to another participant until October 31, 2025. A fee will apply for these changes. It is not possible to defer your entry to next year.