5 ultra events in King County, Washington

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

• Squak Mountain [evergreentrailruns.com] [Register at ultrasignup.com] - Instagram
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  Sat, Apr 18, 2026

  12k 50k Half Marathon Kids Run Ultra

  21492 SE May Valley Rd, King County, Washington, 98027, United States
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• Pigtails Challenge [nwenduranceevents.com] [Register at ultrasignup.com]
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  Sat, May 23, 2026

  50k Ultra

  16640 SE Old Petrovitsky Road, King County, Washington, 98058, United States
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• Grand Ridge [evergreentrailruns.com] [Register at ultrasignup.com] - Facebook - Instagram
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  Sat, Nov 07, 2026

  50k Half Marathon Kids Ultra

  King County, Washington, United States
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