15 mile

  • The 2016 15 mile course (previously known as the half marathon race) is now longer thanks to amazing trail work on Guaje Ridge that added some distance. For those that did not run in 2014 or 2015, the course had one significant change from previous years: Shortly after the Mitchell Trail AS at mile 4.2, runners will turn left and go uphill on the signed "Mitchell Trail 69" to gain the ridge. This ridge trail parallels the drainage where the course used to go before returning to the original course at the base of the steep, long switchbacks leading up to Guaje Ridge.
50k and 50 mile
The 2016 50k and 50 mile courses remain largely the same as 2014 and 2015. There is one significant 50M/50k change for 2016; The Satch-Cowan segment will be eliminated in order to reduce distance of both races. Details about this change will be communicated in more detail later. For those that didn't run in 2014 but had run previously, significant changes from 2013 are:
  • After the Camp May Road AS (mile 10.4) and around mile 11 runners turn left and head south on a dirt road to eventually reach the newly-restored Upper Pajarito Canyon Trail (UPCT) and turn right onto the UPCT to ascend the southeast side of Pajarito Mountain to its summit before descending to the Ski Lodge AS (mile 18.6). From here the 50k finishes as it always has finished.
  • The 50 mile course section through the Valle Grande (caldera) is shortened and follows the pre-2012 50 mile caldera segment. From the Valle Grande AS (mile 25.4) runners go east past the pond and ascend to the Cerro Grande Mountain/Pajarito Mountain saddle before descending nice singletrack in Cañon de Valle to the Pajarito Canyon AS (mile 31.4).
  • From the Pajarito Canyon AS (mile 31.4), the 50 mile runners go west and ascend single track in Pajarito Canyon to again rejoin the UPCT to the top of Pajarito Mountain again and down to the Ski Lodge AS again (mile 38.6). From there the 50 mile finish is the same as it has always been.

Start: Posse Shack, North Mesa in Los Alamos, NM. The 50 mile run starts at 5:00am, the 50 kilometer starts at 6:00am, and the 15 mile starts at 8:00am.

Directions to start/finish: Take Diamond Drive north to the roundabout. Go straight through the roundabout and up the hill onto North Mesa. The Posse Shack is approximately 1 mile from the round about. (Google map of Posse Shack).

Cutoffs: For the 50 mile runners there is a 12:30pm cutoff at the Pipeline Road Aid Station (this is for the first pass though at mile 21.4). Any 50 mile runners missing this cutoff will be allowed to switch to the 50km race at the Pipeline AS and finish from there. The 50 mile runners also have a 3:00pm cutoff at the Pajarito Canyon AS (mile 31.4). Runners missing this cutoff will DNF and be transported back to the start/finish.

For both the 50k and 50 mile runners there is a 5:00pm cutoff at the Ski Lodge Aid Station (second pass through for 50 mile runners at mile 38.6).

Aid Stations Driving Directions for crew/spectators can be found in the 2016 Runners Manual.

Maps of the Los Alamos Area marked map of Los Alamos townsite


You can download the course map to your smartphone and see your GPS location directly on it. No cell service necessary. Just follow these 3 easy steps:

  1. Copy the URL of the JMTR geospatial-enabled PDF courses map, http://www.highaltitudeathletics.org/jmtr/JMTRcourses.pdf
  2. Install the free Avenza PDF Maps app on your smartphone - iPhone or Android
  3. Open the JMTR course map with the app (Maps, + (add), paste URL). The map could take several minutes to download (large file)

Course GPS Tracks

Aid Stations

15 Mile

50 Kilometer

50 Mile

  1. Crews are allowed at all aid stations except for Valle Grande (AS #5 for 50 milers). The aid stations marked "Yes" for vehicle access can be reached with a short walk. All others require hiking.
  2. Flash lights will be collected for the 50 mile runners. Make sure your light is labeled with your name and race number.
  3. Crews are discouraged from going to Guaje Ridge aid station and the Pipeline Road aid station.
  4. There is a 12:30pm cutoff time (first time through, at mile 21.4) for 50 mile runners and runners arriving after 12:00pm will be encouraged to switch to the 50k race.
  5. Cut off at Pajarito Canyon AS is at 3:00 PM. Runners missing this cutoff will be marked as DNF and transported back to the start/finish.
  6. Cut off at Pajarito Ski Area Lodge is at 5:00 PM. All runners must LEAVE the Ski Lodge aid station heading to Pipeline Road aid station by 5:00 PM. Any runner leaving the Ski Lodge AS after 4:00 pm will be required to carry a light.