Top 100 Mile Ultra

San Diego 100

Pine and granite boulder terrain in the Cuyamaca Mountains near Julian, California, the San Diego 100 course

An old-school favorite — 85% singletrack through five distinct terrain zones, and a regular Western States qualifier.

Quick facts

  • Location: Lake Cuyamaca, near Julian, CA (about 50 miles east of San Diego)
  • Date: Friday, April 30, 2027, 6:00 a.m. start (the 25th annual running)
  • Distance: 100 miles, 32-hour cutoff
  • Website: sandiego100.com
  • Contact: sandiego100rd@gmail.com
  • Registration: UltraSignup, opens January 1 at 12:01 a.m., first-come-first-served until 300 entrants or April 1

Course description

Starts and finishes at Lake Cuyamaca, staying mostly between 4,000 and 5,000 feet in the Cleveland National Forest’s Mount Laguna District. The course strings together five distinct regions: Lake Cuyamaca, Rancho Cuyamaca and Anza-Borrego State Parks, Noble Canyon, the Mt. Laguna Recreational Area, and a section of the Pacific Crest Trail — 85% technical singletrack, running under a permit on the Cleveland National Forest.

Elevation change

Over 13,000 feet of combined ascent and descent.

Aid stations

16 fully stocked aid stations, with drop bag service at 8 of them. Notable stops include Pioneer Mail, Cibbets Flat (mile 64), Meadows, and Sunrise — the larger stations with the most food variety, some of which are hit twice depending on the routing.

Special conditions & average temps

Late-April/early-May in the Cuyamaca and Laguna Mountains means warm, dry days and genuinely cold nights at elevation — bring layers regardless of the daytime forecast. This is a cupless event: runners are required to carry their own cup or container at aid stations, no disposable cups provided. Runners over 60 may start one hour early, though aid stations still open on the standard schedule.

Recent results — top 3, men & women

2026

  • Men: 1. Juan Rocha 19:54:05 · 2. Nicholas Kopp 20:54:52 · 3. Michael Palo 21:30:10
  • Women: 1. Laura Liedle 23:26:23 · 2. Kelly Young 24:31:47 · 3. Alyssa Malley 25:23:08

2025

  • Men: 1. Rob King 19:50:00 · 2. Jason Baker 20:20:20 · 3. Jake Jackson 21:29:02
  • Women: 1. Brianna Grigsby 20:22:41 · 2. Jian Springer 22:59:52 · 3. Olga King 26:18:40

2024

  • Men: 1. Jesus Topete Jr 17:58:20 · 2. Jesse Haynes 19:48:33 · 3. George Torres 20:25:52
  • Women: 1. Alyssa Clark 21:19:08 · 2. Elizabeth Shell 24:40:14 · 3. Meghan McKinney 26:33:17

Registration deadline & how to get in

Opens January 1 at 12:01 a.m. on UltraSignup, first-come-first-served until the field hits 300 entrants or April 1, whichever comes first — no lottery. Applicants must have completed an official 50-mile race in 13 hours or less, or a 100K/100-mile race, within roughly the prior two years. Entrants also owe 6 hours of trail-work volunteering (or a $105 donation in lieu) before race day. The 50% refund deadline is March 15. San Diego 100 is a regular Western States 100 qualifying race — finishing within 32 hours qualifies a runner for the WSER lottery.

Traveling to this race? Find lodging near the venue via Hotels.com.