4 ultra events in San Mateo County, California

From big races to Saturday morning group runs—find ultra events and connect with the local endurance sports community.

• Woodside/Purisima Creek Crossover [insidetrail.com] [Register at ultrasignup.com] - Facebook
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  Sat, Apr 18, 2026

  10k 35k 50k Half Marathon Ultra

  1100 Kings Mountain Rd, San Mateo County, California, 94062, United States
  OpenStreetMap Google Maps
• Run for Amma [runforamma.org] [Register at ultrasignup.com] - Facebook
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  Sat, May 16, 2026

  10k 30k 50k Run Ultra

  Skyline Ridge Open Space Preserve, San Mateo County, California, United States
  OpenStreetMap Google Maps

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