| Distance | 100.0 mi |
| Distance (metric) | 160.9 km“Scenic & Challenging 100 Miles in Mt Laguna Recreational Area and along the Pacific Crest, Noble Canyon, and Lake Cuyamaca Trails.” source |
| Course type | single-loop“The race start/finish venue is located at Lake Cuyamaca near the mountain community of Julian.” source |
| Elevation gain | 13,000 ft“The course is 85% single-track technical trails and includes just over 13,000 feet of climbing/descent each.” source |
| Net elevation | 0 ft“The race start/finish venue is located at Lake Cuyamaca near the mountain community of Julian.” source |
| Terrain | mountain, forest“We encourage entrants to volunteer through trail work on your local trails or the trails in the Mount Laguna District of the Cleveland National Forest where the San Diego 100 is largely run.” source |
| Nearest town | Julian“The race start/finish venue is located at Lake Cuyamaca near the mountain community of Julian.” source |
| State | CA“The San Diego 100 starts and finishes at Lake Cuyamaca located 9 miles south of Julian, CA.” source |
| Country | US“The San Diego 100 starts and finishes at Lake Cuyamaca located 9 miles south of Julian, CA.” source |
| Race starts at | Lake Cuyamaca, Julian, CA“The race start/finish venue is located at Lake Cuyamaca near the mountain community of Julian.” source |
| Nearest major airport | SAN“San Diego Airport (SAN) and Lake Cuyamaca, CA ... The road distance is 55 miles.” source |
| Driving distance to airport | 55.0 mi“The road distance is 55 miles.” source |