Course
Three trail races in Marin County, California, run over one weekend: a single-loop 50K on the Friday, a point-to-point 100K on the Saturday and a single-loop 28K on the Sunday. The routes summit many of the county's highest points, including Loma Alta and Big Rock Ridge, and are supported by staffed aid stations.
Key dates
- ✓Entries openedMon 14 Sep 2026
- ★Race daySat 20 Mar 2027
About
Welcome to The Big Alta, a collaborative trail running event produced by Daybreak Racing & Freetrail in trail-famous Marin County, California! With every step, these thoughtfully crafted courses provide an unforgettably scenic trail race experience. The Big Alta now offers three race distance options over a 3-day race weekend: a tough, inspiring single loop 50K on Friday, a NEW world-class point-to-point 100K on Saturday, along with a shorter yet equally exhilarating single loop 28K on Sunday.
Save The Big Alta to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Redwood (Spring) Trail Run
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Pioneertown 10K & Half Marathon
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.