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Boston 2 Big Sur Challenge


The 2017 Challenge:
2 marathons
2 coasts
13 days

Boston 2 Big Sur Presented by ASICS

Only the fittest (or craziest!) ever attempt back-to-back marathons...much less 3,000 miles apart. 2017 will mark the eighth presentation of the Boston 2 Big Sur Challenge and we will welcome 400 of the world's fittest athletes to participate in two of the world's greatest marathons. 

Click HERE to see 2017 Boston Times


Random drawing registration for the 2017 Boston 2 Big Sur Challenge has now concluded. Lists of those selected and not selected are now available online HERE

  • If you are already registered for the Big Sur Marathon by way of the random drawings conducted in July and August, you will still need to register for the B2B drawing. If you are selected, we will void and refund your earlier registration. If you are not selected, you can still run the Big Sur Marathon but without the B2B perks. 
  • 400 slots available
  • Registration for the drawing will take place between October 1-9. There is no entry fee and the day/time you register does not affect your chances of being selected
  • You may enter the drawing only once; any duplicate registrations will be removed prior to the selection process
  • Winners will be announced no later than Tuesday, October 11 
  • Winners will be notified by email and a list posted on this website. The email will contain registration instructions
  • There will be a 7-day registration period; if you do not register during this time you forfeit your registration opportunity

All B2B participants will receive the following:

  • Your entry into the 2017 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 training shirt in gender specific sizing
  • custom participant bib and unique B2B finisher's medallion (you will also receive a BSIM finisher medallion)
  • Access to a catered B2B hospitality finish tent in Big Sur's Marathon Finish Village. You can purchase Guest Passes for friends and family to join you in the tent for $20 per ticket.
  • An entry to the Big Sur Post-Race Celebration Party to be held race evening.  Additional tickets can be purchased for $25. 
  • Awards are presented race day to the top five male and female participants based on their combined Boston and Big Sur times.
2017 Boston 2 Big Sur Finisher Jacket by ASICS (women's in red, men's in green)
B2B 17 Womens Jacket
2017 Men's B2B Finisher Jacket 


The Big Sur Marathon will officially end at 1 PM when the course will reopen to regular two-way vehicular traffic.  There will be NO support of any kind on the course (aid stations, medical, communications, etc.) for anyone not maintaining a 6-hour pace.Those who do not reach marathon mile 21.2 by 11:50 AM will not be allowed to proceed past that point and will be provided transportation to the finish. Official finish times, medallions, certificates, and post-race refreshments are only available for runners who finish under six hours (chip time).

Challenge rules include:
  • To qualify for the challenge, you must also be an official entrant in the 2017 Boston Marathon. You can register for Boston either through your qualifying time or through one of their charity programs.  B2B registration fees do not cover your Boston entry.
  • 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. 

Questions? Or, for more information, email sally@bsim.org or call 831.625.6226