The San Gabriel back country retains much of the natural beauty, if not the primitive wilderness of yesteryear… Thanks largely to the foresight and capable supervision of
the U.S. Forest Service and hundreds of volunteers. Picnic areas and campgrounds
have been constructed with minimum displacement of the natural setting.
The 2027 AC100 100-mile lottery is open through Monday, October 26 at 11:59 PM PT. Entrants and the waitlist will be announced Friday, October 30. View Registration and Lottery Details →
Review the 2027 course from Loma Alta Park to Mt. Hillyer and back. View the Course Map and Elevation Profile →
View aid-station mileage, runner times, crew and pacer access, drop bags, and official cutoff times. View the Checkpoint Cutoffs →
Qualifying races offer automatic entry into the 2027 AC100. View the Sterling Silver Ticket Races →
Lottery closes: Monday, October 26, 2026 at 11:59 PM PT
Entrants & Waitlist Published: Friday, October 30, 2026
Qualifying races offer automatic entry into the 2027 AC100. Learn more about the Sterling Silver Ticket Program →
The 2027 AC100 trail-work schedule will be announced.
The 2027 official training-run schedule and course previews will be announced.
If you’re interested in HAM certification or want to volunteer please visit the Ham Radio page.
Official 2026 AC100 course photos will be provided by Orlando Baez (@orlando_.b) and are expected to be available approximately two weeks after the race on AC’s Smug Mug.
The 2026 AC100 Race Book is now available.
Read the Race Book →
Follow the race during race weekend with AC100 Live Tracking.
View Live Tracking →
The 36th Annual AC100 is scheduled for October 3, 2026.
We’re excited to announce That’s No Moon as the newest Sterling Silver Ticket Race for AC100 2026.
The top 2 male and top 2 female finishers in the 50 Miler on September 20, 2025 in Silverado, CA
will earn automatic entry into AC100, bypassing the lottery.
Learn more on the event page.
Join the Wednesday Night Run Crew for a special Mount to Coast demo run on Wednesday, August 27. It’s a great chance to test out the new trail shoes and connect with fellow runners.
Location & Time: See Run Republic’s Strava page for details.
Exclusive Discount: Use code AC100MTC at mounttocoast.com for 15% off, valid through September 30.
If you’re interested in HAM certification or want to volunteer please visit the Ham Radio page.
2025 AC100 Course Photos. Photos: Paksit Photos.
2025 AC100 1st Place Finisher. Photos: Bernard Falki
