Trail Run races in Seattle, WA

Looking for trail races near you in Seattle, WA? There are 9 upcoming trail races listed here. The next one is Cougar Mountain Trail Run Series (August) on Sat, Aug 8, 2026 at Sky Country Trailhead — see the full list below for dates, venues, and registration links, and browse trail races in other cities.

All 5K (177) 10K (95) Half Marathon (76) Marathon (20) Trail Run (9)

Sat, Aug 8, 2026 Cougar Mountain Trail Run Series (August) Sky Country Trailhead · Bellevue, WA · From $40 5K10KMarathonTrail Run Trail
Sat, Oct 3, 2026 North Bend Trail Fest 30k - 10k 1300 W North Bend Way 5K10KTrail Run Trail
Sat, Oct 10, 2026 Defiance 50K / 30K / 15K Point Defiance Park · Tacoma, WA · From $58 5KTrail Run Trail
Thu, Oct 29, 2026 Ten Trails Active Club Trot n' Treat Relay Scramble 23089 SE Fir St · Black Diamond, WA Trail Run Trail
Sat, Oct 31, 2026 Cougar Mountain Trail Run Series (October) Sky Country Trailhead · Bellevue, WA · From $40 5KTrail Run Trail
Thu, Nov 26, 2026 Ten Trails Active Club 5k Turkey Trot 23089 SE Fir St · Black Diamond, WA 5KTrail Run Trail
Sat, Nov 28, 2026 2026 Seattle Ghost Marathon, Half & 50K 5018 Lake Washington Blvd. S · Seattle, WA · From $120 5K10KHalf MarathonMarathonTrail Run Trail
Sat, Feb 13, 2027 Ten Trails Active Club Heartfelt Hustle 23089 SE Fir St · Black Diamond, WA 5KTrail Run Trail
Sat, May 8, 2027 Bainbridge Island Parks & Trails Foundation Trillium Trail Run Battle Point Park · Bainbridge Island, WA · From $30 5K10KTrail Run Trail

New to the distance? Read trail vs. road racing, or set your target with the pace chart.

Quick answers

When is the next trail race in Seattle?

The next Trail Run in Seattle, WA is Cougar Mountain Trail Run Series (August) on Sat, Aug 8, 2026 at Sky Country Trailhead.

How many trail races are coming up near me in Seattle?

There are currently 9 upcoming trail races listed in Seattle, WA, each with a date, venue, and direct registration link.

What's the cheapest Trail Run in Seattle?

The lowest listed entry right now is Bainbridge Island Parks & Trails Foundation Trillium Trail Run at from $30. Registration prices usually rise as race day nears, so early entry is cheapest.