The Angeles Crest 100, or AC100, is a 101 mile long footrace through the the San Gabriel Mountains. Most of it is on trail, and much of it is on the legendary Pacific Crest Trail. Originally run in October, the race is now run on the first weekend in August. Temperatures in the canyons can exceed 100 degrees. The men’s course record is 17:35, set by Jim O’Brien back in 1989. The women’s course record is 21:04, set by Pam Smith in 2014.