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Fall trail races near Seattle (2026)
Updated
7 trail races are on the calendar near Seattle in fall 2026, starting with Lake Washington Half Marathon on Saturday, October 17 in Kirkland. That covers September to November. 1 of them publish an upcoming price increase, so signing up early saves money.
All fall races5K races (45)10K races (22)Half marathons (15)Marathons (2)Trail races (7)
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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from $40Goes up Oct 19
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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 -
from $52Goes up Nov 8
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from $15
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Ten Trails Active Club 5k Turkey Trot
Thu Nov 26 · 8:30 AM · Black Diamond · Eastside & South King
5KTrail
from $10
Other seasons near Seattle
Quick answers
How many trail races are near Seattle in fall 2026?
7 trail races are listed near Seattle in fall 2026. The first is Lake Washington Half Marathon on Saturday, October 17 in Kirkland, and the last is Ten Trails Active Club 5k Turkey Trot on November 26.
What is the cheapest trail race near Seattle in fall 2026?
Ten Trails Active Club 5k Turkey Trot on November 26 has the lowest listed entry fee: $10. Prices are before the registration platform's processing fee.
When does the next early-bird price end for trail races near Seattle?
West Seattle Monster Dash: the 5K goes from $40 to $45 after October 19.
Are there half marathons or marathons near Seattle in fall 2026?
Yes: 2 half marathons and 0 marathons. The first is Lake Washington Half Marathon on October 17.