Angeles Crest 100 Mile Endurance Run
Angeles Crest 100 is a Southern California mountain 100-miler through the San Gabriels, known for heat, altitude swings, and old-school endurance.
Marathon Scout prioritizes official race websites, registration pages, timing providers, results pages, and race-linked live tracking. Last updated July 13, 2026.
Angeles Crest 100 Mile Endurance Run quick facts
- Historic Southern California 100-miler in the San Gabriel Mountains.
- 2026 course starts and finishes in Altadena because of Highway 2 closure constraints.
- Course profile lists about 100.8 miles of mountain running.
- Heat management and high-country night conditions shape the race.
About the Angeles Crest 100 Mile Endurance Run
The Angeles Crest 100 Mile Endurance Run is one of the older American 100-mile mountain ultras. The 2026 edition uses an Altadena start and finish because of Highway 2 closure constraints, keeping the race rooted in the San Gabriels.
Angeles Crest 100 Mile Endurance Run course description
The 2026 full-course profile lists 100.8 miles through Southern California mountain terrain. Runners should expect long climbs, exposed trail, technical descents, and elevation changes between foothill heat and higher San Gabriel sections.
Weather for the Angeles Crest 100 Mile Endurance Run
Early October in the San Gabriels can still bring hot, dry foothills, cooler high-country nights, and wind exposure. Heat management and late-race temperature swings are part of the race's character.
Past Angeles Crest 100 Mile Endurance Run dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Saturday, October 3, 2026 | — | — |
| 2025 | Saturday, August 2, 2025 | Completed | Open results |
| 2024 | Saturday, August 3, 2024 | Completed | Open results |
Angeles Crest 100 Mile Endurance Run FAQ
When is the Angeles Crest 100 Mile Endurance Run?
The 2026 Angeles Crest 100 Mile Endurance Run is on Saturday, October 3, 2026.
How do I register for the Angeles Crest 100 Mile Endurance Run?
You can register for the Angeles Crest 100 Mile Endurance Run at ac100.com.
Featured collections
Send Marathon Scout an official race update
Share official dates, registration links, results, live tracking, course details, or claimed-profile updates. We review updates before they go live.