Transfers, category changes and deferrals are now available for additional fee (plus the difference in entry fees, if upgrading to a longer distance). The deadline to transfer, change or defer is October 20, 2024. For instructions on how to transfer your registration, change categories, or defer click here.

Category change fee – $20
Half marathon Transfer fee –  $25


Registrants who are pregnant and are unable to participate in the race can email registration@bsim.org with a doctor’s note for a one-time deferral at no charge.


Per the marathon running industry policy, all entry fees are non-refundable. This policy applies to all entrants and is in effect whether you are injured, have an unexpected family/business emergency, have a medical emergency, etc. If the course has to be changed or the race cancelled due to an act of nature, or the event time changed due to circumstances beyond our control, there are no refunds or rollovers. You may not sell or give your bib to another person without going through the transfer process. There are NO exceptions.

You do have the option to purchase opt-in registration protection at the time of registration.

Your entry fee IS NOT TRANSFERABLE to a future year. If you need to cancel, please email us at registration@bsim.org to inform us of your cancellation.


We have switched our registration company to haku and information about registration protection is available in the entry path.


While it may seem like no big deal to run without registering (a bandit) or give or sell your race bib to another person, it does present serious issues to both the race organizers and the participant field. Race results and finisher’s awards can be impacted and medical staff might not be able to identify a participant in need of treatment on the course. It is imperative that the person wearing the bib and taking part in the race is the same person that is in our registrant database.

If a person is caught wearing a bib that is registered to someone else, both parties will be banned from participating in all Big Sur events for a period of one year. The person wearing the bib will also be disqualified from any official results.