Qualifications:  Waived this year.

The registration fee is $190.

In the event that we must cancel the race due to circumstances beyond our control (including fire, disaster, pandemic related issues, cancellation of permits) we will make every effort to refund registration fees to the extent we are able, however the amount of refunds due to emergency cancellations will depend on the timing of cancellations and current sunk costs.

In the event that you must withdraw from the race, you may request a refund of $150 before 7/01/21, and $100 before 9/01/21.  Refunds will only be processed through Venmo or Paypal; Ultrasignup does not process refunds, and we will not mail any checks.

There will be no transfers, rollovers, or discounts for next year's race.  There will be no refunds after 9/01/21.

You must register through:


Past Cuyamaca 100k Endurance Run events have been sanctioned by USATF and our current sanction is pending USATF approval.