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100K Races in California, United States 2026 3 events

100 kilometres — a serious ultramarathon. Browse upcoming events in United States.

Upcoming races

RunningIn 3 weeks

Cuyamaca 100k

◎ Julian, USA▤ Oct 3, 2026

100 km

RunningIn 5 months

Sean OBrien 100K/50M/50K/26.2/30K

◎ Calabasas, USA▤ Jan 30, 2027

100 km

RunningIn 5 months

Sycamore Canyon 100k / 50K / Half

◎ Poway, USA▤ Feb 27, 2027

100 km

Also in United States

5K Races in California10K Races in CaliforniaHalf Marathons in CaliforniaMarathons in California50K Races in CaliforniaUltramarathons in California