Upcoming Ultramarathons in California

Endurance Grid lists 10 ultramarathons in California, from September 2026 to April 2027 across 10 cities.

10
Races
10
Cities

The lay of the land

Ultramarathon Races in California

The ultramarathon race calendar in California is busiest in October, January, and April, with races most often in Napa, San Diego, and San Francisco.

What an ultramarathon is

An ultramarathon is any running race longer than 26.2 miles. The most common distances are the 50K, 50-mile, 100K, and 100-mile — alongside timed events, where you cover as much ground as you can in a fixed window like 6, 12, or 24 hours.

Many ultras run on trails, with aid stations stocked with food, water, and posted cutoff times. For most entrants the goal is to finish, not to race the clock, and hiking the climbs is a normal part of the day.

Frequently Asked Questions (FAQs)

How many ultramarathons are in California?+
Endurance Grid's Race Calendar lists 10 upcoming ultramarathons in California across 10 cities, from September 2026 to April 2027.
What ultramarathon distances are offered in California?+
Ultramarathons in California include 1 Mile, 10 Mile, 100 Mile, 10K, 15K, 50 Mile, 50K, 5K, and more distances.
When is ultramarathon season in California?+
Ultramarathon season in California runs spring through fall. Of the upcoming ultramarathons on Endurance Grid's Race Calendar, the most are in October and January.
Which California cities have ultramarathons?+
Ultramarathons in California are held in Avalon, Buellton, Dinuba, Escondido, Lake Forest, Napa, Norco, Reedley, San Diego, and San Francisco.

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