Trail ultramarathons in California, United States
Find trail ultramarathons in California, United States. Compare 31 upcoming events by date and location. Open a race guide for the course, recorded editions and official entry information where available.
Events to explore include No Name Trail Races, Trail Run at Sly Park - Fall and Chino Hills Trail Run — Fall.
31 listed events · 31 with upcoming dates
Upcoming ultramarathons
31 matching events, earliest date first. Entry availability is shown separately.
No Name Trail Races
USAAgoura, California
Trail races through Cheeseboro Canyon in the Santa Monica Mountains, with an ultra, half marathon and shorter course.
· 50K
Race details, entry and past editions →Entry information ↗Trail Run at Sly Park - Fall
USAPollock Pines, California
Autumn trail races around Jenkinson Lake at Sly Park Recreation Area.
· 50K
Race details, entry and past editions →Entry information ↗Chino Hills Trail Run — Fall
USABrea, California
Autumn trail races through chaparral, oak woodland and the hills of Chino Hills State Park.
· 50K
Race details, entry and past editions →Entry information ↗Rio Del Lago Endurance Runs
USAGranite Bay, California
Trail ultras starting at Beals Point, following the lakes and foothills between Folsom and Auburn.
· 50K
Race details, entry and past editions →Entry information ↗Griffith Park Trail Races
USALos Angeles, California
Hilly trail races on Griffith Park’s singletrack and fire roads, starting at the Merry-Go-Round parking area.
· 50K
Race details, entry and past editions →Entry information ↗Calero Trail Run Winter
USASan Jose, California
Winter trail races on Calero County Park’s singletrack and rolling dirt paths, with several distances from one mile to an ultra.
· 50K
Race details, entry and past editions →Entry information ↗OTHTC High Desert Ultra
USARidgecrest, California
Desert trail races on rolling dirt roads above Ridgecrest, starting and finishing at Cerro Coso Community College.
· 50K
Race details, entry and past editions →Entry information ↗San Joaquin River Trail
USAFriant, California
Trail races following the hills beside Millerton Lake and the San Joaquin River, starting at South Finegold Picnic Area.
· 50K
Race details, entry and past editions →Entry information ↗Doomsday
USACool, California
Trail races from the Cool Staging Area, with a 50K ultra and half marathon through the surrounding foothills.
· 50K
Race details, entry and past editions →Entry information ↗Woodside Ramble
USAWoodside, California
Trail races through the redwood forest and hills of Huddart County Park.
· 50K
Race details, entry and past editions →Entry information ↗Hacienda Hills Trail Run – Winter
USASan Jose, California
Winter trail races through the hills of Almaden Quicksilver County Park.
· 50K
Race details, entry and past editions →Entry information ↗No Hands Trail Run
USAAuburn, California
Trail races in the American River canyon near Auburn.
· 50K
Race details, entry and past editions →Entry information ↗Crystal Springs Winter Trail Run
USAWoodside, California
Winter trail races through Huddart Park and the coastal redwoods.
· 50K
Race details, entry and past editions →Entry information ↗Folsom Lake Sweetwater Trail Run
USAEl Dorado Hills, California
Trail races beside Folsom Lake, mainly on singletrack with some dirt road.
· 50K
Race details, entry and past editions →Entry information ↗Del Dios Trail Race
USAEscondido, California
Trail races around Lake Hodges, with singletrack and dirt service roads.
· 50K
Race details, entry and past editions →Entry information ↗Fort Ord Trail Run
USASalinas, California
Trail races through Fort Ord National Monument across two days.
· 50K
Race details, entry and past editions →Entry information ↗Will Rogers Ultra
USAPacific Palisades, California
Timed and fixed-distance trail races on a loop at Will Rogers State Historic Park.
· 100K
Race details, entry and past editions →Entry information ↗Sycamore Canyon Ultras
USAPoway, California
Looped trail ultras and a half marathon at Sycamore Canyon Preserve.
· 100K / 50K
Race details, entry and past editions →Entry information ↗Marin Ultra Challenge
USASausalito, California
Demanding coastal trail ultras through the Marin Headlands and Mount Tamalpais.
· 50K
Race details, entry and past editions →Entry information ↗Redwood (Spring) Trail Run
USAOakland, California
Trail races through Redwood Regional Park with redwood groves and ridge views.
· 50K
Race details, entry and past editions →Entry information ↗VALENCIA Trail Race
USAValencia, California
Hilly trail races on ridges and through canyons above the Santa Clarita Valley.
· 50K
Race details, entry and past editions →Entry information ↗Leona Divide
USALake Hughes, California
Mountain trail ultras and a 30K starting in Lake Hughes.
· 100K / 50K
Race details, entry and past editions →Entry information ↗Coyote Two Moon
USAOjai, California
Mountain ultras through Los Padres National Forest above Ojai.
· 100K
Race details, entry and past editions →Entry information ↗Grizzly Peak Trail Run
USABerkeley, California
Trail races through the wooded hills of Tilden Regional Park.
· 50K
Race details, entry and past editions →Entry information ↗Cinderella Trail Run
USAOakland, California
Trail races through Joaquin Miller and Redwood Regional parks.
· 50K
Race details, entry and past editions →Entry information ↗Malibu Canyon Trail Races
USAMalibu, California
Trail ultras and shorter races in Point Mugu State Park.
· 100K / 50K · Status TBC
Race details, entry and past editions →San Lorenzo River Trail Run
USASanta Cruz, California
Trail races through redwood forests and across the San Lorenzo River.
· 50K
Race details, entry and past editions →Entry information ↗Elder Creek Night Runs
USAAnza, California
Night trail races through desert singletrack near Anza.
· 50K · Status TBC
Race details, entry and past editions →Harding Hustle
USAModjeska Canyon, California
Trail races through the Santa Ana Mountains on Harding Truck Trail.
· 50K · Status TBC
Race details, entry and past editions →Lost Sierra Endurance Race
USADownieville, California
Mountain trail races through the northern Sierra Nevada around Downieville.
· 100K / 50K
Race details, entry and past editions →Entry information ↗Race archive
Past races and previous editions
Looking back at a race? Browse the guides below for recorded editions. This section also includes events awaiting a new date and cancelled editions. Previous editions of races in the upcoming calendar are available through their race guides above.
No separate archived race guides are listed for this selection yet.
View full race archive (0) →Choosing a race in California
The unfiltered upcoming calendar includes events in Oakland (3), San Jose (2), Woodside (2). Use the town filter to compare locations, then check the race guide for the start venue and organiser’s travel information.
Questions about ultramarathons in California
Which trail ultramarathons are coming up in California, United States?
No Name Trail Races is listed for 24 October 2026. Trail Run at Sly Park - Fall is listed for 24 October 2026. Chino Hills Trail Run — Fall is listed for 7 November 2026. Check the race guide and organiser’s latest information before making plans.
Where can I find race entry details for California, United States?
Follow the link from the race guide to the organiser or entry provider, where one is available. Check the entry deadline, eligibility and current availability there. A listed race date does not necessarily mean entries are still open.
Why has a race moved out of the upcoming calendar?
Once its listed dates have passed, a race moves to the past-editions view unless another upcoming edition is recorded. Cancelled events also leave the upcoming list. The race guide stays available, and the event returns when a new date is added.