Key Dates

• 100-Mile Lottery Opens: Monday, October 12, 2026 at 12:00 AM PT
• 100-Mile Lottery Closes: Monday, October 26, 2026 at 11:59 PM PT
• Entrants and Waitlist Announced: Friday, October 30, 2026
• The lottery remains open through 11:59 PM PT on October 26.
• Trail Work and 100-Mile Qualifier Deadline: September 2, 2027
• Race Day: Saturday, October 2, 2027

How the 100-Mile Lottery Works

• All qualified runners may enter the lottery.
• Approximately 210 positions will be available through the lottery. Remaining positions are reserved for volunteers, sponsors, Sterling Silver Ticket recipients, and other race commitments.
• Your card will only be charged if you are selected.
• Runners who are not selected will be placed on the waitlist in lottery order.
• Previous AC100 finishes, prior unsuccessful lottery attempts, volunteer service, entry in the Solo division, and pursuit of four or more consecutive finishes may increase selection odds.
• The Solo division does not allow pacers or crew.
• Division changes will not be permitted after registration.

2027 Refund Policy

• 50% refund through April 1, 2027
• 25% refund through August 1, 2027
• No refunds after August 1, 2027
• Entries are nontransferable.
• No deferrals or rollovers unless the race is canceled or AC100 approves an exception.
• Contact AC100 directly to request a refund.

100-Mile Entry Requirements

• Complete an official race of 50 miles or longer between January 1, 2026, and September 2, 2027.
• Results must be published online through UltraSignup, UltraRunning, or another official results provider. Virtual races do not qualify.
• You may enter the lottery before completing your qualifying race.
• Complete and submit eight hours of trail work by September 2, 2027.

Trail Work

• 100-mile entrants: eight hours by September 2, 2027.
• 100K entrants: four hours by September 2, 2027.
• Southern California entrants living south of Fresno must complete trail work with AC100 in the Angeles National Forest.
• Entrants living north of Fresno, outside California, or outside the United States may complete comparable trail work with a local trail organization or race.
• Trail work must be submitted and approved by the deadline.
• AC100 trail work opportunities will be posted on the Trail Work page and the AC100 Facebook page.

Solo Division

• No pacers or crew are allowed.
• Solo entry may increase lottery selection odds.
• No division changes are allowed after registration.
• Solo runners are eligible for Solo Division awards and recognition.

Angeles Crest 100K

The Angeles Crest 100K is a separate race held on the same day as the AC100. It starts at 7:00 AM and begins and ends at Loma Alta Park in Altadena.

• Distance: Approximately 62.5 miles
• Elevation gain: Approximately 11,800 feet
• Registration: Separate from the 100-mile lottery
• Course map: View the official CalTopo map

100K Rules

• Pacers are not permitted.
• Crew assistance is not permitted.
• Drop bags are planned. Locations, limits, and procedures will be announced after operating plans are finalized.

Final aid-station locations, cutoff times, and other course details will be announced after operating plans are confirmed.

Stay Updated

• Visit ac100.com/#news-schedule.
• Follow the AC100 Facebook page.
• Join the AC100 Facebook group.
• Subscribe to race news at the bottom of this page.

Email Communications

Once you register, you will automatically be added to the entrants email list. AC100 sends race updates and important information directly to registered runners.

For more information, review the application FAQ.