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Marathons in Eastside & South King (2026-27)

Updated October 17, 2026

No marathons are listed in Eastside & South King in the next 90 days; the next is Washington State Marathon on Sunday, April 18 in Redmond. 4 marathons are listed in Eastside & South King for the next 12 months; the next one starts from $150.

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• Sun18Apr

  Washington State Marathon

  Sun Apr 18 · 8:00 AM · Redmond · Eastside & South King

  MarathonTrail

  from $150Goes up Nov 1
• Sat29May

  Spring - Mud Mountain Dam Marathon & Half Marathon

  Sat May 29 · 7:00 AM · Enumclaw · Eastside & South King

  Half marathonMarathon

  from $105Goes up Jan 1
• Sat19Jun

  Super Hyak Marathon and Half

  Sat Jun 19 · 7:00 AM · North Bend · Eastside & South King

  Half marathonMarathon

  Reg. closed
• Sat4Sep

  Fall - Mud Mountain Dam Marathon & Half Marathon

  Sat Sep 4 · 7:00 AM · Enumclaw · Eastside & South King

  Half marathonMarathon

  from $105Goes up Jan 1

Quick answers

How many marathons are in Eastside & South King in the next 3 months?

None are listed between October 17 and January 15. The next one after that is Washington State Marathon on Sunday, April 18 in Redmond.

When does the next early-bird price end for marathons in Eastside & South King?

Washington State Marathon: the Marathon goes from $150 to $165 after November 1. 2 more of these marathons publish a later price increase.

Are there marathons in Eastside & South King this weekend?

None are listed for October 17 to October 18. The next is Washington State Marathon on Sunday, April 18 in Redmond.