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Trail races in Eastside & South King (2026-27)
16 upcoming trail races in Eastside & South King in the next 12 months. The next is Lake Washington Half Marathon on Saturday October 17 in Kirkland.
All SeattleSeattle (city) (5)Eastside & South King (16)Snohomish County (2)Tacoma & South Sound (2)
By date
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Lake Washington Half Marathon
Sat Oct 17 · 8:00 AM · Kirkland · Eastside & South King
Half marathonTrail
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Ten Trails Active Club Trot n' Treat Relay Scramble
Wed Oct 28 · 6:30 PM · Black Diamond · Eastside & South King
11KTrail
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Cougar Mountain Trail Run Series (October)
Sat Oct 31 · 8:00 AM · Bellevue · Eastside & South King
5K7.6 miles19.5 miles50KTrail
from $40 -
Ten Trails Active Club 5k Turkey Trot
Thu Nov 26 · 8:30 AM · Black Diamond · Eastside & South King
5KTrail
from $10 -
from $30Goes up Nov 1
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Ten Trails Active Club Heartfelt Hustle
Sat Feb 13 · 8:00 AM · Black Diamond · Eastside & South King
5KTrail
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Woodinville Half and 10K
Sat Feb 27 · 8:00 AM · Woodinville · Eastside & South King
10KHalf marathonTrail
from $60Goes up Nov 16 -
Brooks Lake Sammamish Half Marathon presented by REI
Sat Mar 6 · 7:30 AM · Redmond · Eastside & South King
Half marathonTrail
from $91Goes up Nov 1 -
from $51Goes up Nov 1
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from $150Goes up Nov 1
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Lake Wilderness Triathlon and Run
Sat Jun 5 · 7:00 AM · Maple Valley · Eastside & South King
5.5K10KTrail
from $55Goes up Apr 26 -
Snoqualmie Valley Half
Sat Jun 19 · 8:30 AM · Carnation · Eastside & South King
10KHalf marathonTrail
from $54Goes up Nov 1 -
from $75Reg. closed
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Iron Horse Half Marathon
Sun Aug 29 · 7:00 AM · North Bend · Eastside & South King
Half marathonTrail
from $97Goes up Jan 1 -
Redmond Harvest Half Marathon
Mon Sep 6 · 8:30 AM · Redmond · Eastside & South King
Half marathonTrail
from $59Reg. closed -
Cirque Series - Crystal Mountain, WA
Sat Sep 11 · 8:00 AM · Crystal Mountain · Eastside & South King
7.9 milesTrail
from $99