Los Alamos, NM, United States · Saturday, May 9, 2026
Fixed Distance 50K
Jemez Mountain 50km Trail Run
Race completed
50 km Distance
not publishedn/a Climbing
2.5 est Grit · Entry level
Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.
What the course asks
Field size ~203 Large. Rarely out of sight of another runner.
DUV results for the 2026 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, May
Daytime high 21°C
Night low 4°C
Rainfall Dry — rain unlikely
Daylight 13 h 52 m of light
Regional 2001-2020 average for May — NASA POWER, grid elevation 2346 m. Not a forecast.
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of trail.
- Trail Running Shoes50 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition50 km of self-supported fuelling between aid stations.
- Hydration VestsFlask capacity for 50 km, without the bounce.
- GPS WatchesBattery life first — a 50 km day outlasts most full-GPS modes.
Course Notes
Single track trails and dirt roads in and around Los Alamos, NM in the scenic Jemez Mountains.
Similar races
Other 50K trail ultras, closest in distance first.