Saturday, Aug 3, 2019 @ 5:00 AM

Angeles Crest 100 Mile Endurance Run

Loma Alta Park

Altadena, CA • 100 Miler

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This Event Took Place Sat. Aug 3, 2019

See the 2026 event

36TH ANNUAL
ANGELES CREST 100 MILE ENDURANCE RUN

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The Angeles Crest 100 Mile Endurance Run has been held since 1986 and is one of the original five 100-mile endurance runs in the United States. Traditionally run point-to-point through the San Gabriel Mountains, the course has evolved over the years in response to trail conditions, closures, fires, and safety considerations while remaining rooted in the rugged terrain and history of Angeles Crest.

The 36th Annual AC100 will take place October 3, 2026, on a modified 100-mile course through the San Gabriel Mountains. Runners will encounter steep climbs, rocky trails, remote backcountry, and approximately 100 miles of demanding mountain terrain. AC100 is not easy, but every finisher knows the journey is worth it.

The training runs and trail workdays leading up to race day are an important part of the AC100 experience, giving runners an opportunity to prepare, build friendships, and give back to the trails. Preparing physically and mentally for AC100 is essential, but so is taking time to appreciate the San Gabriel Mountains and the unique experience of traveling through them on foot.

For those ready to take on the challenge, the 36th Annual Angeles Crest 100 Mile Endurance Run will be held October 3, 2026.

Lottery Process

Lottery registration opens 9/19/25 and closes 9/29/25.

All runners may enter. We use a Lottery due to high demand and limited spots.

210 spots available via Lottery; remaining spots are reserved.

Entrants List announced 10/03/25.

Complete a 50+ mile qualifier between 01/01/25 and 9/3/26 (results published online). You may register before submitting your qualifier.

Trail Work due by 9/3/26. North of Fresno or out-of-state may do local TW; SoCal entrants must do TW with AC100.

SOLO division = no pacers, no crew; no division changes after signup.

Previous finishes, not selected last year, or SOLO status may increase selection odds.

Elevation profile for the 2026 AC100 course - 100.8 miles from Loma Alta Park to Mt. Hillyer and back, with approximately 20,000 feet of elevation gain.

2026 AC100 Course Map - 100.8-mile loop starting and finishing at Loma Alta Park in Altadena.

2026 refund policy

50% up until May 1.
25% up until September 1.

course

AC100 is one of the first five 100-mile endurance runs in the United States. As of November 2022, there are 217 100-mile races. AC100 is one of only six point-to-point 100 milers. The first edition was held in 1986. Since then, the course has remained mostly consistent. The original finish line was the Rose Bowl in Pasadena through 1991. In 2008 the finish line was moved to Loma Alta Park, in Altadena.

2026 course changes

Due to current road and trail closures and the effects of recent fires, the 2026 AC100 will use a new 100.8-mile loop course starting and finishing at Loma Alta Park in Altadena.

Runners will travel through Clear Creek, Josephine Peak, Red Box, Newcomb, Shortcut and Chilao before reaching Mt. Hillyer. The course then returns through Chilao, Shortcut and Newcomb before continuing through Chantry Flats, Mt. Wilson, Sam Merrill and Millard to the finish at Loma Alta Park.

AWARDS

Completing the AC100 race is an outstanding accomplishment. The Awards Ceremony that follows is an event worth experiencing. Take pleasure in celebrating with your fellow runners and families. If you complete the race in less than 33 hours, you will receive an official AC100 Finisher's tech t-shirt and a bronze buckle. During the award ceremony, every finisher will be recognized with a personalized engraved plaque bearing their name and finishing time.

the buckles

All Finishers get a Finisher Plaque with their Name and Finish Time engraved on it as they cross the Finish Line.

All Finishers get a Finisher T-shirt. The Solo Finisher gets Solo Finisher T-shirt.

Runners who cross the Finish Line in less than 24 hours receive the Solid Sterling Silver Buckle.

All Runners finishing between 24 and 24:59:59 hours receive the Solid Bronze Second Sunrise Ram Buckle.

Any Runner who completes the race between 25:00 and 33:00 hours is awarded with the 33 Hour Solid Bronze Ram Buckle.

Solo Finisher who finish in Sub 24 hours receive the 24-Hour Solo Solid Sterling Silver Buckle.

All Solo Finishers between 25:00 and 33:00 receive the 33 hour Solo Solid Bronze Ram Buckle.

Any female runner who breaks the existing female course record of 21:04:18 receive the 24-Hour Solid Sterling Silver / 14K Gold Rejoice Buckle.

Any runner who breaks the existing traditional-course record of 17:35:48, set by Jim O’Brien in 1989, receives the 24-Hour Solid Sterling Silver buckle plated in 14K Gold. The record has stood for 37 years, and only four other runners have ever broken the 19-hour mark on the traditional course. Both men and women are eligible for this award. The 2026 loop course is not eligible for the traditional course-record award.

The Trophies

The Ram: Presented to the Overall Male and Overall Female winners.
The Cougar: Presented to the First Male Solo and First Female Solo runners. If the Overall winner also ran in the Solo division, The Cougar will be presented to the next Solo finisher.
The Elk: Any runner officially finishing 10 AC100 races, over any time period.
The Eagle: Any runner officially finishing 10 consecutive Angeles Crest 100-mile Endurance Runs.
The Grizzly: Any runner officially finishing 20 consecutive Angeles Crest 100-mile Endurance Runs.