The course is held 40 miles inland in the mountains east of San Diego. There is 15,800 feet of elevation gain. The course is known for being pretty technical, exposed (no trees) and windy. June is usually hot, typically in the 80s and windy on the ridge and 90s in the canyons. The hardest part is that, after mile 15, you NEVER, ever have shade until 72 miles into the race. The course starts and finishes at Al Bahr Campground on Sunset Highway and does a loop SW and then connects to the PCT (Pacific Crest Trail) and runs north hovering on a ridgeline between 4,500 and 6,000 feet overlooking the Anza Borrego desert to the east. The course then heads west and down into Noble Canyon (the hot part of the course) for a figure eight loop and back up Green Valley to the ridgeline and the PCT. Then a northern loop along the shore of Lake Cuyamaca, over Stonewall Peak and then down the drainage paralleling Hwy 79 as it descends toward San Diego, then back up to gain the ridge (at mile 51/80) and take the PCT back 20 miles south to finish at Al Bahr.
San Diego 100 Race Report: Course Record Run « Jeff Browning Ultrarunning Blog – Ultramarathons – Endurance Trail Running – Running 50K, 50 Miles, 100k, 100 Miles