Marathon races in Seattle, WA

Looking for marathons near you in Seattle, WA? There are 20 upcoming marathons 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 marathons 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
Sun, Aug 9, 2026 Tunnel Vision Marathon & Half Marathon NF-906, Hyak Dr E. · Snoqualmie Pass, WA 5K10KHalf MarathonMarathon Road
Sat, Sep 5, 2026 Medal Madness 5K, 10K, 13.1M & 26.2M at Everett, WA (36) 600 128th St SE · Everett, WA · From $30 5K10KHalf MarathonMarathon Road
Sat, Sep 12, 2026 Cascade Express Marathon & Half Marathon Homestead Valley Trailhead · North Bend, WA · From $119 5K10KHalf MarathonMarathon Road
Sat, Sep 12, 2026 Beat the Blerch Tolt-MacDonald Park · Carnation, WA · From $40 5K10KHalf MarathonMarathon Road
Sat, Sep 19, 2026 Fall - Mud Mountain Dam Marathon & Half Marathon 30525 S.E. Mud Mountain Rd. · Enumclaw, WA · From $70 5K10KHalf MarathonMarathon Road
Sun, Sep 20, 2026 Quilcene Oyster Races 151 E. Columbia St. · Quilcene, WA · From $25 5K10KHalf MarathonMarathon Road
Sat, Oct 3, 2026 Haunted 5K, 10K, 13.1M & 26.2M at Everett, WA (40) 400 Smith Island Rd · Everett, WA · From $30 5K10KHalf MarathonMarathon Road
Sun, Oct 11, 2026 2026 The Snohomish River Run Marathon, Half Marathon, 10K and 5K 1301 1st St · Snohomish, WA · From $45 5K10KHalf MarathonMarathon Road
Sat, Nov 28, 2026 Seattle Kids Marathon Seattle Marathon Road
Sat, Nov 28, 2026 2026 Seattle Ghost Marathon, Half & 50K 5018 Lake Washington Blvd. S · Seattle, WA · From $120 5K10KHalf MarathonMarathonTrail Run Trail
Sun, Nov 29, 2026 UW Medicine Seattle Marathon and Half Marathon Seattle Half MarathonMarathon Road
Sun, Nov 29, 2026 2026 UW Medicine Seattle Marathon 5th & Harrison · Seattle, WA Half MarathonMarathon Road
Sun, Nov 29, 2026 2026 UW Medicine Seattle Half Marathon 5th & Harrison · Seattle, WA Half MarathonMarathon Road
Sat, Dec 12, 2026 Sunrise Marathon 5K/10K/13.1 SEATTLE Lincoln Park (Course Map will be emailed) · Seattle, WA · From $30 5K10KHalf MarathonMarathon Road
Sat, Jan 16, 2027 Sunrise Marathon 5K/10K/13.1 SEATTLE Lincoln Park (Course Map will be emailed) · Seattle, WA · From $30 5K10KHalf MarathonMarathon Road
Sat, Mar 20, 2027 Sunrise Marathon 5K/10K/13.1 SEATTLE Lincoln Park (Course Map will be emailed) · Seattle, WA · From $30 5K10KHalf MarathonMarathon Road
Sun, Apr 18, 2027 Washington State Marathon 6046 W Lake Sammamish Pkwy NE · Redmond, WA · From $99 10KMarathon Road
Sat, May 1, 2027 Tacoma City Marathon / Half / Ghost / 10K / 5K / 1K Dune Peninsula Park · Tacoma, WA · From $10 5K10KHalf MarathonMarathon Road
Sat, Jun 12, 2027 Seattle Marathon Summer Events Seward Park · Seattle, WA 5K10KHalf MarathonMarathon Road

New to the distance? Read the best fall marathons, or set your target with the pace chart.

Quick answers

When is the next marathon in Seattle?

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

How many marathons are coming up near me in Seattle?

There are currently 20 upcoming marathons listed in Seattle, WA, each with a date, venue, and direct registration link.

What's the cheapest Marathon in Seattle?

The lowest listed entry right now is Tacoma City Marathon / Half / Ghost / 10K / 5K / 1K at from $10. Registration prices usually rise as race day nears, so early entry is cheapest.