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Trail races in Eastside & South King (2026-27)
Updated
5 trail races are coming up in Eastside & South King in the next 90 days; the next is Lake Washington Half Marathon on Saturday, October 17 in Kirkland. 16 trail races are listed in Eastside & South King for the next 12 months.
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
Quick answers
How many trail races are in Eastside & South King in the next 3 months?
5 trail races are listed in Eastside & South King between October 17 and January 15. The next is Lake Washington Half Marathon on Saturday, October 17 in Kirkland.
What is the cheapest trail race in Eastside & South King right now?
Ten Trails Active Club 5k Turkey Trot on November 26 has the lowest listed entry fee in the next 90 days: $10. Prices are before the registration platform's processing fee.
When does the next early-bird price end for trail races in Eastside & South King?
K9 Candy Cane 5K Fun Run: the 5K goes from $30 to $40 after November 1. 7 more of these trail races publish a later price increase.
Are there trail races in Eastside & South King this weekend?
Yes, 1: Lake Washington Half Marathon (Sat).