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

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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 Lodge is approximately 1 mile from the round about. (Google map of Posse Lodge).

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50 Mile Race Cutoffs/Mandatory Switch to 50k:​

• 12:00pm - [24.7 miles] at Ice Rink [mandatory switch to 50k]
  Any 50 mile runner departing Ice Rink after 11:30am should seriously consider switching to the 50km at Ice Rink as it is unlikely that one would make the 2:20pm mandatory switch to 50k at Mitchell (first time).

• 2:20pm - [33.8 miles] at Mitchell First Time [mandatory switch to 50k]

• * 3:00pm - [21.7 miles] at Camp May Road (both 50 mile and 50k runners have a 3pm cutoff at Camp May)

• 8:20pm - [49.0 miles] at Mitchell 2nd time

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50k Race Cutoffs:

• 3:00pm - [21.7 miles] at Camp May Road

• 5:00pm-  [24.7 miles] at Ice Rink

• 8:20pm - [27.9 miles] at Mitchell

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* 50 mile racers have a 3:00pm cutoff at Camp May Road [21.7 miles]. A 50 mile runner moving slow enough to risk the 3:00pm cutoff at Camp May Road won't be able to beat subsequent cutoffs/switch to the 50k race at Ice Rink or Mitchell. 

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Aid Stations: Aid Stations Driving Directions for crew/spectators can be found in the 2025 JMTR Runners Manual.

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

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Pacers:

Pacers are allowed for the 50 mile race starting at the first pass through the Mitchell aid station (mile 33.8)