Event or Permit Cancellation:

If for any reason the event is cancelled due to an act of nature or other Forest Service permit issues, the race director will make every effort to refund all unobligated funds to entrants or will roll over entry fees to a rescheduled race date. Entrants need to understand and accept the fact that there are always risks involved in staging an ultra in the wilderness and there can be no guarantees that all entry fees will be refunded if the run is not held as advertised.

To Apply:

The 2015 event entrant field is now established and no further entries will be accepted.

Applications for entry to the 2016 race will again be accomplished using: UltraSignup beginning January 1, 2016 at 8:00 am PST. There will be a three day entry period and then a lottery will ensue to select the 250 entrant's field. There will also be an ordered wait list for those not selected in the lottery.


Entrants must show proof of finishing an official sanctioned 50-mile race within the event time limits and within 13 hours from January 1, 2014 through January 1, 2016. The completion of a 100 mile or 100K event during the last 2 years will also serve as qualification.

As a requisite for participation, entrants are required to volunteer 6-hours towards trail maintenance or volunteer work at a running/community event. This requirement must be accomplished prior to June 1 with mail or email notification (to the RD) once the service is completed. We expect the greater San Diego area participants to complete their volunteer service on the San Diego trails we use for the 100 miler. Information about the San Diego Trailfit program and how to sign up for a workday are located at: San Diego Trailfit.

Download the 2014 Volunteer Completion Form.

Entry Fee:

Entry to SD 100 is $240 plus the Ultra Signup fee (aprox $16). If an entrant withdraws from the event and notifies the race director prior to May 1, 2015, they are entitled to a $120 refund. No refunds after May 1, 2014. No rollovers or transfer of entries are permitted once an applicant is a confirmed entrant.