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UltraUnited StatesCalifornia

Big Alta2027

19.03 – 21.03.2027San Rafael (United States)
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Pacing, fueling and crew sheet for the course you pick

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3 courses · 28–100 km · up to 3’886 m D+

3 courses

  1. 28km

    1’189 m D+

    1’317 m D-

    avg 4%

    28 km
    No index
    GPX

  2. 50km

    2’042 m D+

    2’157 m D-

    avg 4%

    50 km
    No index
    GPX

  3. 100km

    3’886 m D+

    3’889 m D-

    avg 4%

    100 km
    No index
    GPX

Course analysis

100 km3’886 m D+

139effort kmⓘ100 km on the map · feels like 139 km
D+
3’886 m
D−
3’889 m
Max alt.
727 m
Steepest
12%

Segments

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Elevation profile: 100 km

3 m — 727 m

Feels like these

Race plan

Plan your race from start to finish.

Pacing, aid stations and fueling timed to your effort on Big Alta, in one roadbook.

Build your race plan →

The race

A collaborative trail running event in Marin County, California, offering 50K, 100K, and 28K races with scenic views across the San Francisco Bay Area.

Where to stay

Find a place to stay near San Rafael for the race.

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