*** Photos available from Howie Stern ***

Ready to do it again in 2025? https://ultrasignup.com/register.aspx?did=116822

NEW THIS YEAR! 

One hour early start for runners over 60 – Runners over the age of 60 will be allowed to start 1 hour early. However, the aid stations will open at the usual times, so runners taking advantage of this option should be prepared to self-support until the Cuyamaca Peak aid station. More details in the 2025 Racebook when posted. 

Scotty Mills Scholarships – Scott Mills is the former long-time RD for San Diego 100 and has fostered the running community in San Diego for years. This year, we will be awarding up to 2 free entries for folks who best demonstrate Scotty’s defining trait of giving back to their community, running or otherwise. If interested, please prepare a 2 to 3-paragraph write-up of why you or someone else is deserving of a free entry. Send entries to us at sandiego100rd@gmail.com. Please get these in no later than December 28. 

10% Discount for Active Military and First Responders! – We appreciate your service! Please contact us via email for a discount code if you qualify. If you are not active military or a first responder and you try to claim a discount, just remember that stolen valor is bad karma. 

Improved internal cutoffs!  – With the new course last year, we found that some of the later cutoffs were a bit tight, so we will be stealing some time from the early cutoffs to give folks more time later in the race. Overall, the cutoff remains the same at 32 hours!

The 2025 San Diego 100 has been selected as a qualifying race for the 2026 Western States 100. Runners who complete the race within 32 hours will qualify to enter a lottery where the runners for Western States will be selected.   The qualifying period for the 2026 Western States will be from November 4, 2024, through November 2, 2025. The lottery will be held on December 6, 2025, and the race itself will be run on June 27-28, 2026.

SD100 made it onto the cover page of Ultrarunner magazine!!!! If you have a subscription, you can read Angela and BJ’s article here.

An Old School Favorite!

Scenic & Challenging 100 Miles in Mt Laguna Recreational Area and along the Pacific Crest, Noble Canyon, and Lake Cuyamaca Trails. The 24th annual event will begin on Friday, June 6th, 2025, at 0600. More details to follow!

Registration for the 2025 race will open January 1 at 12:01 AM and will be first come, first serve. If you have any questions, please contact us at sandiego100rd@gmail.com. Thanks, and see you in 2025!

Here’s the Ultrasignup link.

Qualification requirements to enter the 2025 event are as follows:
Applicants must have completed an official 50-mile race in 13 hours or less or a 100k or 100-mile race between January 1, 2023 and March 15, 2025. If a lottery is required, priority will be given to those runners who have completed their qualifying race. Should there be a lottery, runners signing up during the lottery signup without a qualifier will be placed on the waitlist and will keep their place on the waitlist and/or be granted entry pending their completion of the qualifier. No lottery has been necessary since the race expanded its field to 300 runners, but last year we were full by January 10, so we encourage you to sign up early. SURF members of at least 3 months of good standing receive an extra ticket in the lottery should one be necessary. Volunteers who gave 6 hours or more to the race the prior year receive a lottery bypass. The race directors reserve the right to grant up to 10 entries to runners who have performed outstanding work for the SD 100 or contributed to the field of trail running.

We will accept applications on Ultrasignup beginning 1/1/2025 through the deadline of midnight of 01/04/2025. A lottery will take place if over 300 qualified applications are received. If there are fewer than 300 applicants, entries will reopen on Ultrasignup on 1/5/2025 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 waitlisted applicants to receive a slot is April 15, 2025. 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 the year prior to the start of the 2025 race as a requisite to participate or donate $105 to San Diego 100 to support the TrailFit Program in lieu of their volunteer hours. We encourage entrants to volunteer through trail work on your local trails or the trails in the Mount Laguna District of the Cleveland National Forest where the San Diego 100 is largely run, but volunteering at an ultra or other race is acceptable. Please see our volunteer page for further information.

SD 100 is a Cupless event.

Please send comments and suggestions about this website to webmaster@sandiego100.com.