Welcome to 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 16th annual event.


Where: Lake Cuyamaca, California, USA
Race Day Runner Tracking: Ultralive
New: Friday Start at 6:00am: (6/9/2017)
Registration: Ultrasignup

2018 (17th) RACE STARTS IN:

Our 2018 race date will be posted soon.


Qualification requirements to enter the 2017 event are as follows: Applicants must have completed an official 50 mile race in less than 13 hours from between January 1,2015 through May 1, 2017. Anyone who has completed an official 100K or 100 mile run in the last 2 years (January 1, 2015 to May 1, 2017 is also qualified to apply.

Applications were accepted on Ultrasignup beginning 1/1/2017 through midnight 1/3/2017. A lottery was not required for this year so applications have reopened on Ultrasignup through May 1, 2017. The qualification period has also been extended through May 1, 2017.

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: scottemills51@gmail.com

Raffle Ticket Sales

Sales for a 2018 free entry to SD 100 and numerous other Sponsor Giveaway Gifts. Proceeds support SD Trailfit and Ultra Medics

Our Sponsors

  • Altra Running Footwear
  • Black Diamond
  • Clif Bar
  • Dirty Girl Gaiters
  • Foot Kinetics
  • High Desert Drop Bags
  • Injinji
  • Julbo Eyewear
  • Movin Shoes
  • Orangemud
  • Patagonia
  • Pulse
  • Running Skirts
  • SD Ultra Running Friends (SURF)
  • SoCal Ultra Series
  • Squirrel's Nut Butter
  • Tailwind Nutrition
  • Ultra Running Magazine
  • Ultra Trail Du Mont Blanc
  • Ultralive.Net
  • Western States
Race Pictures By:
Howie Stern Photos
© 2017 San Diego 100