San Diego 100
100 miClosed

San Diego 100

Lake Cuyamaca, CaliforniaSan Diego 100 Race DirectorField of 300
Days to go
190

At a glance

Date
Apr 30, 2027
Location
Lake Cuyamaca, California
Distances
100 mi
Registration
Closed Apr 1, 2026, via ultrasignup.com

Listed from UltraSignup. Checked Oct 18, 2026.

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About this race

A loop course consisting of 90% single track mountain course covering four recreational areas in San Diego east county mountains. Includes Pacific Crest Trail, Noble Canyon, Cuyamaca and Anza Borrego State Parks, and Mt Laguna areas. Very challenging technical course with approximately 15,400 feet of climbing and descent, 32 hour time limit.

Key dates

Registration opens

Jan 1, 2026

Registration closes

Apr 1, 2026

Race day

Apr 30, 2027

190d

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Tune-up races

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  • The Ranch 50k

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    50K, 11 weeks before race day, 30 mi away, registration open

Straight-line distance

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