The Lost Trail Half Marathon & 5K

Saturday, February 24, 2024 • Granite Bay, CA • Course Map

active-reg-buttonPart of a series of running, cycling and triathlon events staged throughout the year in the Sacramento and Folsom Lake area by Roseville, Calif.-based race management company TBF Racing, the Lost Trail Half Marathon Challenge takes runners and walkers on a looping route through Folsom Lake State Park along the lake’s western shore.

Just over 210 runners and walkers crossed the finish line in the race’s 13.1-mile and 5K events at the 2018 race, 115 of which took part in the half marathon — which, like the 5K, follows an out-and-back course that starts and finishes on the park’s beach overlooking Granite Bay.

From there, runners first head through the paved parking lot and then onto the trails that take them south along the lake’s shoreline, with small hills in the early miles of the race.

It’s the later miles that bring the more challenging hills, as runners will ascend what’s known as Mooney Ridge in the second half of the race, before turning back to head to the beach for the race finish.

The hills don’t last for too long, however — the race organizers describe them as “short but steep,” along with plenty of scenic views of the lake from the hills above.

Runners will start the half marathon at 8:00 AM, while those running or walking (or running and walking) the 5K race will start at 8:05 AM.

Race Weather & Climate

Located along the shore of Folsom Lake in Northern California, about 25 miles northeast of Sacramento and roughly 110 miles northeast of San Francisco, Granite Bay typically sees February temperatures that average between 36°F and 43°F, while rainfall totals average just over 8.4 inches, making February its wettest month of the year, discounting the snow.

On the day of the race (Feb. 24), the average low is 36°F and the average high is 44°F.

Past Results

Course Map

See the race route map for the Lost Trail Half Marathon here.

Starting Time

  • 8:00 AM – half marathon
  • 8:05 AM – 5K


  • $50 – $60 for the half marathon
  • $35 – $45 for the 5K


To reserve your spot in the 2024 running of Granite Bay’s Lost Trail Half Marathon Challenge or 5K Run/Walk, register online at here.


Official Race Website


Ever run in the Lost Trail Half Marathon? Share your impressions here, or post your review in the Comments below.

See more races in: February, California

2 comments… add one
  • Ingrid Clegg January 8, 2018, 11:54 pm

    I ran the lost trail half marathon March 1 2013 and was hoping to get my results. Can you email me the list for some reason its not showing on your site.

    thank you,

    Ingrid Clegg

  • Andrea Chavez December 29, 2017, 12:57 pm

    Is there an age limit? My 11 year old wants to run the half with me. She has run a 10k and up to 8 miles I will set train with her she loves running .
    Thank you
    Andrea Chavez


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