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
50K
Mar 19, 2027
straighten
Distance —
50K
terrain
Type —
Running
timer
07:00
sell
$180.00
100K
Mar 20, 2027
straighten
Distance —
100K
terrain
Type —
Running
timer
06:00
sell
$335.00
28K
Mar 21, 2027
straighten
Distance —
28K
terrain
Type —
Running
timer
08:00
sell
$140.00
Weather History
These values represent the 3-year monthly averages for March in Marinwood.
thermostatTemperature
6.7° / 14.3°
wb_sunnyFeels like
3.6° / 11.6°
light_mode
Avg sunshine hours
8h 46m
water_drop
Avg rainfall
5.5 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
10.9 km/h (Light breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (4.0)
humidity_mid
Humidity
79.6%
wb_twilight
Sunrise
07:18
nightlight
Sunset
19:18
About Marinwood
Learn more about the host city, Marinwood.
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.