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 100 mile trail event through the San Gabriel back country and parts of the Angeles National Forest. The event has been held since 1986 and is organized as an endurance run over natural trails and forest roads. For 2026 the course was changed and the race will start and finish in Altadena due to major Highway 2 closures.
The 36th annual edition is scheduled for October 3, 2026. The event uses a lottery system for entry; the 2026 lottery opened September 19, 2025 and closed September 29, 2025, with entrants and the waitlist published October 3, 2025. Two other races now offer automatic entry into AC100 for top finishers, bypassing the lottery.
Distances related to the event include:
- 100 miles
- 50 miles (That’s No Moon 50 Miler)
- 50 km (Pacifico Ultra 50K)
Volunteer trail work is organized ahead of the race with multiple trail work days in spring 2026 at locations such as Shortcut Saddle, Chantry Flats, and the Switzer Picnic Area. Typical trail work commitments are eight hours. The race is listed as a Western States qualifier and as a UTMB Index 100M qualifying race. Visit the organization's website for the most recent information.
