Running races in Washington in May 2027

36 races in date order

May the Course be with You 5k
May 2027 · Seattle, WA · 5k

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Walk/Run for the Animals
Sat 1 May 2027 · Vancouver, WA · 5K Run · 3 Mile Walk

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ATFS! Garage Sale 5K
Sat 1 May 2027 · Auburn, WA · 5K

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Sun Mountain 50M/50K/25K
Sat 1 May 2027 · Winthrop, WA · 50 Mile · 50K · 25K
Wildflower-lined mountain trails above the Methow Valley in Washington

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never say never half marathon & 10K
May 2027 · Tieton, WA · Half Marathon · 10K
Rolling-hill course with a no-judgment tap-out van

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Kirkland Half Marathon
Sun 2 May 2027 · Kirkland, WA · Half Marathon · 5K · Kid’s Race
Skirts Lake Washington from Juanita Beach Park

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Bloomsday
Sun 2 May 2027 · Spokane, WA · 12K
Spokanes iconic 12K tradition drawing thousands each May

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Tacoma City Marathon
Sun 2 May 2027 · Tacoma, WA · Marathon · Half Marathon · 10K · 5K · Kids 1K
Crosses Tacoma Narrows Bridge past Dune Peninsula Park

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Cougar Mountain Trail Run Series
May 2027 · Bellevue, WA · 10.8 Miles · 5.1 Miles
Runs through Cougar Mountain Regional Wildland Park

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Escape to San Juan Island
Sat 8 May 2027 · Friday Harbor, WA · Half Marathon

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Annual UW Bothell Husky 5K
Sat 8 May 2027 · Bothell, WA · 5K · Kids 1K
Runs past UW Bothell's restored wetland trail

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Pack The Park 5k/Fun Run 2026
May 2027 · Lake Forest Park, WA · 5K

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Sequim Irrigation Festival Run Series
May 2027 · Sequim, WA · 3.2 km
Run within Sequim's century-old Irrigation Festival

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Bainbridge Island Parks & Trails Foundation Trillium Trail Run
Sat 8 May 2027 · Bainbridge Island, WA · 10K · 5K
Loops among towering firs in the Grand Forest

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Snohomish Women's Run
May 2027 · Snohomish, WA · Half Marathon · 10K · 5K

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Beat the Bridge for Breakthrough T1D
May 2027 · Seattle, WA · 8K Run · 3-Mile Walk · 1-Mile Fun Run
Seattle 8K crossing University Bridge before it opens

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Spring Greener 5k
May 2027 · Olympia, WA · 5k
Finale of Evergreen State College's Geoduck Gallop series

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Soaring Eagle Trail Run
May 2027 · Sammamish, WA · Half Marathon · 10K · 5K
Forest singletrack and the Pipeline Trail near Seattle

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Ridge Run 10-Miler
May 2027 · Stevenson, WA · 10 Miler
Point-to-point 10-miler over the Gorge ridge

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Running from Gluten 5K
May 2027 · Seattle, WA · 10K · 5K
Runs along Lake Washington at Magnuson Park

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WW Exchange Club Ducky Derby
May 2027 · Walla Walla, WA · 5K Duck Dash · 1.6 km

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Run Like a Girl
Sat 15 May 2027 · Bellingham, WA · Half Marathon · 10K · 3/6K
Half and 10K along Bellingham Bay's Interurban Trail

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Inspiring Hope Run
Sat 15 May 2027 · Mukilteo, WA · 10K · 5K

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Windermere Marathon
Sun 16 May 2027 · Spokane, WA · Marathon · Half Marathon · 10K · 5K
Runs along the Spokane River through downtown

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Capital City Marathon
Sun 16 May 2027 · Olympia, WA · Marathon · Half Marathon · Five Mile
Boston-qualifying marathon rolling through friendly Olympia Washington

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Sri Chinmoy Self-Transcendence 7 & 13 Hour Races
May 2027 · Seattle, WA · 13 Hour · 7 Hour
Loops past Lake Washington views in Magnuson Park

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Run to End Weekend Hunger 5K
Sun 23 May 2027 · Seattle, WA · 5K Run/Walk · 0.1 km
Around Seward Park on the shores of Lake Washington

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Reflection Run
May 2027 · Washougal, WA · Marathon · Half Marathon · 19.3 km · 10K · 5K
Follows the Columbia River with views of Mt. Hood

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Mud Mountain Dam Marathon & Half Marathon
Sat 29 May 2027 · Orting, WA · Marathon · Half Marathon
Downhill along the Carbon River to McMillin Bridge

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Leavenworth Trail Fest
Sat 29 May 2027 · Leavenworth, WA · Ski Hill 50k · 25k - Sport · 25k - Elite · 25k - Masters · The Town 5k
Mountain trail festival with big climbs beneath the Cascades

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Big River Race
Sat 29 May 2027 · Pasco, WA · Half Marathon · 10K · 5K · 1 Mile Fun Run
Flat, fast course along the Columbia River in Pasco

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Rhinos 5K Fun Run
May 2027 · Everett, WA · 5K
Along the Snohomish River at Lowell Riverfront Park

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Echo Valley
May 2027 · Chelan, WA · 50K · Half Marathon · 10K · 1-mile kid's race
Ponderosa pine trails with sweeping views of Lake Chelan

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Les Schwab TIRES Seabrook Relay
May 2027 · Pacific Beach, WA · Run · Walk
A team relay ending on Washington's coast at Seabrook

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Run the 509
May 2027 · Deer Park, WA · Half Marathon · 10K · 5K

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Evergreen Half and 5 Mile
May 2027 · Snohomish, WA · Half Marathon · 5 Mile Run
Downhill point-to-point on the Centennial Trail

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← Washington Oct Nov Dec Jan 2027 Feb 2027 Mar 2027 Apr 2027 Jun 2027 Jul 2027 Aug 2027 Sep 2027 Oct 2027 Nov 2027

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Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.