Los Alamos National Labs with logo 2021

Taking Care of our Trails

Continued access and use of Los Alamos National Laboratory trails is contingent upon being good stewards of these federal lands.


  • Environmental Communication & Public Involvement
  • P.O. Box 1663 MS K491
  • Los Alamos, NM 87545
  • (505) 667-3792
  • Email


As part of the move to Stage 3 fire restrictions, all Laboratory trails will be closed effective May 7, 2022, in the interest of public safety and to minimize adverse risks. Closing the Lab's trails helps ensure maximum resources are directed where they are most needed in the effort to contain the Cerro Pelado fire and improves road access for firefighting crews.

The Lab appreciates the patience and understanding of trail users during this challenging time. Please adhere to the trails closure and be assured that the trails will reopen when conditions improve sufficiently.

The Reservoir and Devaney-Longmire trails will be closed starting JAN 26 from 7 a.m. to 5 p.m. Monday through Friday for brush removal. Do not park along West Road. Please use the Ice Rink parking lot when accessing the trail during open hours.

Twomile Mesa trail will be closed indefinitely for construction and future operations purposes. Access is from the western end of the LANL Fitness Trails in TA-58 and the other side of the old Anchor Ranch Road. For the safety of both trail users and construction crews, please avoid use of Twomile Mesa trail beginning 31 JAN 2022.

Los Alamos Area Trails application
Interactive map for Los Alamos Area Trails

Click here for a LANL employees only map

Maintaining our Trails

Recreational trails use at Los Alamos National Laboratory has always been highly valued as one of the benefits of working and living in Los Alamos County. Laboratory trails are uniquely located on Department of Energy (DOE) land. Continued public access is conditioned upon treating the land and its resources with care and consideration. Please continue to notify the Trails Management program of any concerns about the trails.

Trail users should not attempt to clear downed trees or other major obstructions on any Laboratory trails, as the trails are on DOE land and some trails present unique hazards, which are posted at each trailhead kiosk.

Input on trails from trail users is paramount to successful maintenance and care of the trails. To report a trail condition or concern or to contact the Trails Management Program, email trails@lanl.gov.

Trail Use

Some Laboratory trails are open to the public whereas others are only open to Laboratory badge holders. Some trails allow dogs, horses, and bicycles while these are prohibited on other trails. It is your responsibility to understand the rules of a particular trail.

Trails are open from dawn to dusk, however trails and trail segments shown in red on trail maps are closed to all entry.

Hike open trails at your own risk; carry water, and beware of weather conditions, hazards, and wildlife.

Please leave no trace and pack out your trash.

Trail Monitoring

Laboratory trails in the White Rock area (TAs 70/71) are actively patrolled by Bandelier National Monument rangers through an agreement between the National Park Service and the Department of Energy.

Other Lab trails may be monitored by the Laboratory's Protective Force.

You are required to acknowledge and comply with law enforcement requests and directions.

Prohibited Activities & Items

The following activities and items are strictly prohibited on Laboratory trails.

  • alcohol consumption
  • camping
  • collecting natural or cultural materials
  • digging or ground disturbance
  • disorderly behavior
  • disturbing archaeological resources
  • dumping or disposal of trash
  • firearms
  • fires
  • fireworks
  • geo caching
  • hunting or trapping
  • memorialization
  • motorized vehicles (unless performing official LANL business)
  • smoking
  • weapons
  • wood gathering
Questions, Comments & Concerns

Report illegal or suspicious activity to: 505-667-2400

To send general inquiries or feedback: trails@lanl.gov

Karla Sartor
LANL Trails Management Program Lead
(505) 667-8719