2026 COURSE NOTICE: The detailed section description below is legacy course information and does not reflect the 2026 route, direction, or mileage. The 2026 race starts and finishes at Loma Alta Park in Altadena on a 100.8-mile out-and-back course to Mt Hillyer. See the
2026 Full Course page and
2026 checkpoint table for current information.
2022 AC100 Ham Radio Volunteer Mt. Hillyer 1 and Mt Hillyer 2 (normally RedBox on regular course). Photo: Dino Darling