The Big Alta

ATRA race member

20221223
2026-03-21

Mar 21, 2026 at 8:00 AM

The Big Alta

247 Shoreline Highway

Mill Valley CA, 94941

USA

Entry Fee $186
(Lowest or Early Registration)

Entry Fee 2 $370
(Highest or Late Registration)

Prize Money: yes

Distance(s):

  • 50K
  • 28K

Type: Trail

High Point: 2,000

Percent of the course on un-paved trails: 100%

First Year of the Event: 2024

Men's Record: Eli Hemming (29)3:19:30

Masters Men Record: Michael Nanaszko (43)3:46:34

Women's Record: Tabor Hemming (28)4:04:58

Masters Women Record: Amy Cameron (45)4:39:22

Description:

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.

A feast for the eyes, these courses will treat runners to seemingly endless vistas that stretch across the entire San Francisco Bay Area. All three courses summit many of the highest points in Marin County, and event namesake pays homage to course landmarks Loma Alta and Big Rock Ridge. The Big Alta will not only challenge its participants physically, but also reward their efforts with awe-inspiring views, heaps of trail community love and of course, all the electric race weekend vibes and hype!

Photos

No photos available.

Map

Past Event Dates

Held on Mar 21, 2026

Held on Feb 22, 2025

Held on Feb 24, 2024

Event Results

View 2025 Results

View 2024 Results