4 ultra events in Sonoma County, California

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

• Lake Sonoma 100K & 50K [runlakesonoma.com] [Register at ultrasignup.com] - Facebook - Instagram
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  Sat, Apr 11, 2026

  50k 100k Half Marathon Ultra

  3227 Stewarts Point-Skaggs Springs Rd, Sonoma County, California, United States
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• Sonoma Coast Trail Runs [ultrasignup.com]
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  Sat, May 30, 2026

  30k 50k Half Marathon Run Trail Ultra

  Sonoma County, California, United States
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• Sonoma Fall Classic [sonomafallclassic.com] [Register at ultrasignup.com] - Facebook - Instagram
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  Sat, Oct 17, 2026

  50 Miles 100 Miles Marathon Relay Trail Ultra

  3227 Stewarts Point-Skaggs Springs Road, Sonoma County, California, United States
  OpenStreetMap Google Maps