Jemez Mountain

Jemez Mountain Trail Runs - May 9, 2026

The Jemez Mountain Trail Runs is the nineteenth annual running event held in the Jemez Mountains with start and finish in Los Alamos, New Mexico. The event in 2026 includes three trail races.

• 50 mile
• 50k
• 15 mile

Registration opens January 3, 2026. Entry fees are listed as $100 for the 15 mile, $150 for the 50k, and $175 for the 50 mile. All entry fees increase by $25 on April 1, 2026. A waitlist is maintained separately for each race through the UltraSignup system.

The courses are run on technical trails with substantial elevation change. The 50k and 50 mile routes include very steep climbs and descents on technical terrain. Runners will encounter high altitude from about 7,000 to over 10,000 feet, fallen trees, and other on-course obstacles. Past events have seen weather extremes including heat, cold, rain, hail, snow, lightning, and strong wind. The course layout has remained the same since 2021; in 2021 the 50 mile route was about 53 miles.

A mandatory gear policy may require runners to carry clothing and equipment to stay reasonably warm and dry when leaving the start or drop-bag-accessible aid stations. Race officials and aid station staff have authority to enforce gear requirements and to pull participants who do not meet safety requirements. Garbage bags are not considered appropriate rain gear. Organizers recommend staging appropriate clothing in drop bags.

Refunds and transfers follow a strict policy. A 50 percent refund is offered only before May 1, 2025 and only if the registrant’s spot can be filled. Starting May 1, 2025 all entry fees are nonrefundable. No transfer of entry to another person or another year is permitted. Event proceeds benefit the Los Alamos High School Cross Country Team and other local organizations. Visit the organization's website for the most recent information.