100mi events in California, United States
Find 100mi events in California, United States. Compare 10 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 Machete Muertos Trail Races, Rio Del Lago Endurance Runs and Boundiful Endurance Runs.
Compare running races by distance, date and surface, from shorter road events to trail races and ultras.
10 listed events · 10 with upcoming dates
Upcoming 100mi events
10 matching events, earliest date first. Entry availability is shown separately.
Machete Muertos Trail Races
USAPerris, California
Mountain trail races around Lake Perris for the Día de los Muertos weekend. The 200-mile race starts on Wednesday, with the shorter races starting on…
Date listed · latest organiser confirmation not yet checked.
Rio Del Lago Endurance Runs
USAGranite Bay, California
Trail ultras starting at Beals Point, following the lakes and foothills between Folsom and Auburn.
Date listed · latest organiser confirmation not yet checked.
Boundiful Endurance Runs
USAHemet, California
Fixed-distance and timed endurance running on a hard-packed dirt loop through a Southern California fruit and nut farm.
Date listed · latest organiser confirmation not yet checked.
New Year’s One Day
USASan Jose, California
Fixed-distance and timed races on an asphalt loop at Hellyer County Park.
Date listed · latest organiser confirmation not yet checked.
Run4Kids Ultra Running Party
USACorona, California
Timed and fixed-distance charity races supporting youth running.
Date listed · latest organiser confirmation not yet checked.
Leona Divide
USALake Hughes, California
Mountain trail ultras and a 30K starting in Lake Hughes.
Date listed · latest organiser confirmation not yet checked.
Silver Moon Race
USAReedley, California
Evening and overnight races on a flat loop beside the Kings River.
Date listed · latest organiser confirmation not yet checked.
Coyote Two Moon
USAOjai, California
Mountain ultras through Los Padres National Forest above Ojai.
Date listed · latest organiser confirmation not yet checked.
Born to Run Ultra Marathons
USALos Olivos, California
A trail-running festival on dirt ranch roads and singletrack near Los Olivos.
Date listed · latest organiser confirmation not yet checked.
Western States Endurance Run
USAOlympic Valley, California
The world’s oldest 100-mile trail race, from Olympic Valley to Auburn.
· Status TBC
Date listed · latest organiser confirmation not yet checked.
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 Corona (1), Granite Bay (1), Hemet (1). Use the town filter to compare locations, then check the race guide for the start venue and organiser’s travel information.
Questions about 100mi events in California
What should I check before a running event in California?
Choose your distance, then check the route, elevation, cut-off time and entry conditions in the organiser’s race guide.
Which 100mi events are coming up in California, United States?
Machete Muertos Trail Races is listed for 30 October 2026. Rio Del Lago Endurance Runs is listed for 7 November 2026. Boundiful Endurance Runs is listed for 28 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.