Event Date:April 30, 2023


Registration details to be announced in July, 2022

Only the fittest (or craziest!) runners ever attempt back-to-back marathons…much less 13 days and 3,000 miles apart! The April 30, 2023 race will mark the 12th presentation of the Boston 2 Big Sur Challenge and we hope to welcome 400 of the world’s fittest athletes to participate in two of the world’s greatest marathons. The Boston Marathon is on Monday, April 17, 2023. This program is for runners who have qualified for an entered the 2023 Boston Marathon and want to run the Big Sur Marathon only 13 days later. HOKA is the official sponsor of Boston 2 Big Sur. All B2B participants will receive exclusive gear and other unique, quality items.



Click for Marathon Race Details


Entry fees for the 2023 Boston to Big Sur are to be announced in July, 2022. 

Registration Timeline:

To be announced in late July, 2022. Registration for B2B is first-come, first-served and limited to a maximum of 400 entrants.

  • To qualify for the Big Sur Marathon B2B Challenge category, you must also be an official entrant in the April 2023 Boston Marathon. You can register for Boston either through your qualifying time, through one of their charity programs, or by invitation. View the Boston Marathon website for all details about registration for the Boston Marathon. There is no official connection between your Boston Marathon registration and the Big Sur Marathon B2B program. B2B registration fees do not cover your Boston entry.

NOTE: If you are registered for B2B and Boston, but do not start or finish at Boston, you are no longer eligible for the B2B Challenge medallion or finisher jacket.


  • An entry into the 2023 Big Sur Marathon as a B2B Challenge runner.
  • A Boston 2 Big Sur finisher jacket in gender-specific sizing (will be distributed in the B2B finish hospitality tent along with the B2B medallion)
  • A Boston 2 Big Sur long-sleeve tech shirt
  • A unique B2B finisher’s medallion (you will also receive a BSIM finisher medallion)
  • Access to a catered B2B hospitality finish tent in the Finish Village. You can purchase Guest Passes for friends and family to join you in the tent for $40 (ages 11 and older), $25 (ages 4-10) and FREE for children under age 4.
  • The pride of being one of the few to undertake this challenge of completing two iconic marathons only 13 days apart in 2023.



Awards will go to the top three men and women under age 40 and the top three Masters men and women, age 40 and over. Awards are based on combined Boston and Big Sur chip times.

The Awards Ceremony begins at 11:30 AM in the Finish Village.