The Big Alta

United States flag Marinwood, California, United States

131 days left

The Big Alta ultrasignup.com
Date 19 Mar – 21 Mar, 2027
Races 3 distances
Entry fee $140.00 – $335.00
Runner rating Be the first to rate
The Big Alta

About the event

The Big Alta is set to unleash its awe-inspiring trail running adventure on the scenic landscapes of Marin County, California, courtesy of Freetrail and Daybreak Racing. This collaborative effort promises an unforgettable race weekend with three distinct distance options: a grueling 50K single loop for those seeking a tough yet rewarding challenge; a breathtaking point-to-point 100K course that now doubles as a Western States Qualifier, offering runners the chance to qualify for one of trail running's most prestigious events; and an equally thrilling but more compact 28K single loop.
The race courses are meticulously crafted to showcase some of Marin County’s highest peaks, providing panoramic views across the entire San Francisco Bay Area. As participants traverse these trails, they will be treated to a feast for the eyes with sweeping vistas that stretch from one horizon to another. The terrain is varied and challenging, ensuring runners experience not just physical exertion but also a profound connection with nature.
The event aims to foster a strong sense of community among trail enthusiasts, offering heaps of support and encouragement throughout each course. Live coverage keeps spectators engaged while the electric atmosphere builds up towards an exciting finish line celebration that honors human achievement in endurance sports. Join Freetrail and Daybreak Racing for what promises to be one of California’s most cherished trail running experiences.
This event is not just a race, but an invitation to embrace the beauty and challenge of Marin County's trails. With its carefully designed courses, stunning views, and supportive community atmosphere, The Big Alta offers more than just miles; it delivers moments that runners will cherish long after they cross the finish line.

Races offered

19Mar

50K

Running

Distance
50K
Start time
07:00
Entry fee
$180.00
20Mar

100K

Running

Distance
100K
Start time
06:00
Entry fee
$335.00
21Mar

28K

Running

Distance
28K
Start time
08:00
Entry fee
$140.00

Weather history

3-year monthly averages for March in Marinwood.

Temperature6.7° / 14.3°
Feels like3.6° / 11.6°
Sunshine hours8h 46m
Rainfall5.5 mm
Snowfall—
Wind10.9 km/h (Light breeze)
Humidity79.6%
Max UV indexModerate (4.0)
Sweat lossLow
Course conditionsFirm and slightly soft
Sunrise07:18
Sunset19:18

About Marinwood

Learn more about the host city, Marinwood.

Scenic view of

Lucas Valley-Marinwood is a census-designated place (CDP) in Marin County, California, United States. It includes the neighborhoods of Lucas Valley and Marinwood. As of the 2020 census, the population was 6,259.

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Hotels & places to stay

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Race results

All-time top performances and historical records for The Big Alta.

Place Name Gender Age Year City Time
🥇 Eli Hemming M 29 '25 — 3:19:30
🥈 Edward Owens M 31 '25 — 3:26:36
🥉 Remi Leroux M 27 '25 — 3:28:30
4 John Luna-Lima M 29 '25 — 3:38:30
5 Eli Hemming M 28 '24 — 3:38:33

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