The Premier 100 Mile Running Event in San Diego
Scenic & Challenging 100 Miles in Mt Laguna Recreational Area and along the Pacific Crest, Noble Canyon, and Lake Cuyamaca Trails. This is the 19th annual event.
Qualification requirements to enter the 2019 event are as follows: Applicants must have completed an official 50 mile race in less than 13 hours from between January 1,2017 through April 15, 2019. Anyone who has completed an official 100K or 100 mile run in the last 2 years (January 1, 2017 to April 15, 2019 is also qualified to apply).

We'll accept applications on Ultrasignup beginning 1/1/2019 through the deadline of midnight of 1/4/2019. A lottery will take place if over 300 qualified applications are received. If there are less than 300 applicants, entries will reopen on ultrasignup until the 300 person limit is reached. A waitlist will be maintained on Ultrasignup once the field limit of 300 is reached. The latest date for wait listed applicants to receive a slot is April 15, 2019. After that date, there will be no refunds for entrants and no other applicants will be accepted.

All entrants are required to perform 6 hours of volunteer work within a year prior to the start of the 2019 race as a requisite to participate. We expect entrants to attempt to accomplish their volunteer work on trail maintenance but volunteering at an ultra or other race, or by volunteering at a community service is acceptable.


The start and finish line are at Lake Cuyamaca which is located at 15207 Highway 79 near Julian, CA. The Lake Cuyamaca web site (with information about camping and RV reservations) is located at: Lake Cuyamaca Website. Also check out additional lodging options under this web site's Event Info link to Accommodations.

Questions not covered on the race website can be directed to:

Please support our sponsors and check out their products:

Lake Cuyamaca, California, USA

2018 Race Photos:
Howie Stern

Runner Racebook:
Now available

Interactive Map


Sales for a 2020 free entry to San Diego 100 and numerous other Sponsor Giveaway Gifts to be selected at this year's pre-race briefing. Proceeds support San Diego Trailfit. Raffle tickets are $5 each or 5 tickets for $20.