Angeles Crest 100 Mile Endurance Run
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Angeles Crest 100 Mile Endurance Run
The Angeles Crest 100 Mile Endurance Run is a long-distance trail event held in the San Gabriel backcountry and Angeles National Forest. Established in 1986, the race covers 100 miles and is organized as an endurance run with aid stations, checkpoint cutoffs, and routing information published for each edition.
The 2026 edition uses a revised out-and-back course that starts and finishes at Loma Alta Park and runs to Mt Hillyer and back. Course updates for 2026 were made necessary by Highway 2 closures and the effects of the Eaton Fire. The event is a qualifying race for larger series, including Western States qualifying status for 2027 and UTMB Index 100M recognition.
Logistics materials are published for each race, including a race weekend schedule, checkpoint cutoff chart listing aid-station mileage and crew and pacer access, and a course map with elevation profile. Registration for the 2026 race was managed by a lottery that opened September 19, 2025 and closed September 29, 2025; the entrants and waitlist were published October 3, 2025. Registration and drop-bag collection are scheduled the day before the race.
The event program includes volunteer-supported trail work days at multiple locations in the forest, with scheduled dates and meeting points provided in advance. Two partner races now offer automatic entry for top finishers into the AC100. Visit the organization's website for the most recent information.
