The Angeles Crest 100-Mile Endurance Run, or AC100, is an ultramarathon 100 miles (162 kilometers) long that takes place annually along trails through California's Angeles National Forest. The course was originally designed to be a challenging 30-hour course, but due to its difficulty, the official cut-off time is set to 33 hours. The race is limited to 150 participants; registrants must qualify by completing at least a 50-mile run in the previous year. The race starts in Wrightwood, following portions of the Pacific Crest Trail (where it climbs Mount Baden-Powell), the Silver Moccasin Trail, and the Gabrielino Trail. It finishes at Loma Alta Park in Altadena, CA, near NASA's Jet Propulsion Laboratory. More information...
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