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 Trail Work Day scheduled for Sunday, May 30, 2026 is on. Meet at the Switzer Picnic Area at 7AM.
Highway 2 closures and the effects of the Eaton Fire have required a new out-and-back course for 2026, starting and finishing at Loma Alta Park. Read the 2026 Race Status Update →
Registration and drop-bag collection will take place Friday, October 2. The race starts at 5:00AM Saturday, October 3, at Loma Alta Park. View the Race Weekend Schedule →
Review the 2026 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 →
Two races now offer automatic entry into AC100 2026.
Top 2 male and top 2 female finishers qualify:
That’s No Moon 50 Miler
September 20, 2025 – Silverado, CA
Pacifico Ultra 50K
May 30, 2026 – Angeles National Forest, CA
August 16, 2026, at 7:00 AM is Canceled.
If you still need trail work, contact Ken Hamada at ken.hamada3@gmail.com.
August 22–23: Training Camp and Course Preview
CTS Ultrarunning Coach Martin Torres will lead a free, two-day training camp on the 2026 AC100 course August 22-23. Registered AC100 runners may attend one or both days.
To register, RSVP through the INCLINE training group on Strava or contact Martin directly at MTorres@trainright.com.
Please note: Runners must be self-supported and carry appropriate gear, fuel, and hydration.
Join us Saturday, September 12 for an official training run covering the final 23 miles of the 2026 AC100 course, from Chantry Flats to the finish at Loma Alta Park.
Meet at 6:30 AM at Loma Alta Park to carpool to Chantry Flats. The route will climb over Mt. Wilson, Eaton Saddle, and Sam Merrill before continuing to the finish.
The course will be marked, but runners are encouraged to have the route loaded on their phone or watch.
An aid station is planned near mile 15 at the top of Sunset Trail/Cape of Good Hope. For questions, contact Dominic at Dominic.Grossman@gmail.com
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 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
