2026 Seattle Marathon Summer 5k/10k/Half Marathon and Kids Fun Run

About the Event

The 2026 Seattle Marathon Summer 5k/10k/Half Marathon and Kids Fun Run returns to Seward Park in Seattle, Washington on June 27th, offering a scenic course along the shores of Lake Washington with views of majestic Mt. Rainier. As one of the city's beloved annual events, this race has become an integral part of summer traditions for runners of all ages, from seasoned athletes to families looking for fun and fitness.
Seward Park offers lush greenery and serene waterfront paths that wind through historic Seattle neighborhoods. The early morning light on June 27th casts a soft glow over the park's iconic landmarks like Pagoda Point and the Seward Memorial Bridge, setting an idyllic backdrop for runners as they take in the natural beauty of the Pacific Northwest. On race day, expect to feel the cool breeze off Lake Washington, adding a refreshing element to what might otherwise be warm summer weather.
Since its inception, this event has grown year after year, drawing hundreds of participants who come together not just to compete but also to support local charities and causes. The Seattle Marathon Summer 5k/10k/Half Marathon and Kids Fun Run is more than a race; it's an opportunity for the community to celebrate health and wellness while fostering connections among runners from all walks of life.
The course itself follows USATF-certified routes through Seward Park, featuring smooth asphalt paths that are both challenging and enjoyable. For the 5K run/walk, participants will enjoy a loop around Pagoda Point with scenic views throughout their journey. The 10K route extends further into the park's interior before returning to the finish line near Lake Washington Boulevard East. Meanwhile, the half marathon takes runners on a longer excursion through Seward Park and adjacent neighborhoods, showcasing more of Seattle’s natural beauty.
Start lines are clearly marked at various points within the park for each distance category. Aid stations will be positioned along the course every mile or so to provide water, sports drinks, and snacks. The elevation profile is relatively flat but includes some gentle hills that add character to the run without being overly strenuous.
On race day, expect temperatures around 16-22 degrees Celsius with an average wind speed of about 10 kilometers per hour blowing from Lake Washington. Humidity levels will hover at approximately 68%, creating a comfortable yet slightly damp atmosphere for runners and spectators alike. There's also a slight chance of scattered showers in the afternoon, so it’s wise to carry rain gear just in case.

10K Run/Walk
10km • Start: 06:00:00 •

5K / 10K Bundle
Start: 06:00:00 •

5K Run/Walk
5km • Start: 06:00:00 •

Half Marathon
21km • Start: 06:00:00 •

Kids Fun Run
1km • Start: 06:00:00 •

Virtual 10K
10km • Start: 06:00:00 • Fee: $49.60

Virtual 5k
5km • Start: 06:00:00 • Fee: $38.82

Virtual 5k/10k Bundle
Start: 06:00:00 • Fee: $73.60

Virtual Half Marathon
21km • Start: 06:00:00 • Fee: $75.44

Virtual Kids Fun Run
1km • Start: 06:00:00 • Fee: $21.59

To register for the event, visit [https://raceroster.com/events/2026/107529/2026-seattle-marathon-summer-5k10khalf-marathon-and-kids-fun-run](https://raceroster.com/events/2026/107529/2026-seattle-marathon-summer-5k10khalf-marathon-and-kids-fun-run). Early packet pickup is available at West Seattle Runner on Thursday, June 25th from 12:00 PM to 6:00 PM and at Super Jock N Jill Green Lake on Friday, June 26th from 12:00 PM to 6:00 PM. On race day itself (Saturday, June 27th), packet pickup begins at 6:00 AM in Seward Park.
The start location for the Half Marathon is located near Pagoda Point within Seward Park. Age requirements vary by distance but generally range from children as young as five years old participating in the Kids Fun Run to adults of all ages running any distance, with no upper age limit specified. All runners should arrive prepared with appropriate footwear and clothing suitable for a summer morning run.
The 2026 Seattle Marathon Summer 5k/10k/Half Marathon and Kids Fun Run promises another memorable day in Seward Park on June 27th, bringing together the community to celebrate running and all it entails. Whether you're an experienced runner or just starting out with your family, this event is a must-attend for anyone who appreciates Seattle's beauty and its vibrant athletic spirit.

Races Offered

10K Run/Walk

Jun 27, 2026

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Distance — 10km

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Type — Others, Running

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06:00

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$78.68

5K / 10K Bundle

Jun 27, 2026

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Distance — 15km

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Type — Others, Running

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06:00

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$118.50

5K Run/Walk

Jun 27, 2026

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Distance — 5km

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Type — Others, Running

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06:00

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$62.52

Half Marathon

Jun 27, 2026

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Distance — 21km

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Type — Others, Running

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06:00

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$122.86

Kids Fun Run

Jun 27, 2026

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Distance — 1km

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Type — Others, Running

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06:00

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Closed

Virtual 10K

Jun 27, 2026

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Distance — 10km

terrain

Type — Others, Running

timer

06:00

sell

$49.60

Virtual 5k

Jun 27, 2026

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Distance — 5km

terrain

Type — Others, Running

timer

06:00

sell

$38.82

Virtual 5k/10k Bundle

Jun 27, 2026

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Distance — Virtual 5k/10k Bundle

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Type — Others, Running

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06:00

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$73.60

Virtual Half Marathon

Jun 27, 2026

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Distance — 21km

terrain

Type — Others, Running

timer

06:00

sell

$75.44

Virtual Kids Fun Run

Jun 27, 2026

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Distance — 1km

terrain

Type — Others, Running

timer

06:00

sell

$21.59

Weather History

These values represent the 3-year monthly averages for June in Seattle.

thermostat Temperature

11.9° / 21.1°

wb_sunny Feels like

9.8° / 18.9°

light_mode Avg sunshine hours

11h 50m

water_drop Avg rainfall

1.1 mm

ac_unit Avg snowfall

—

air Avg wind speed

10.7 km/h (Light breeze)

opacity Sweat loss rate

Moderate

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (5.6)

humidity_mid Humidity

67.9%

wb_twilight Sunrise

05:11

nightlight Sunset

21:07

About Seattle

Learn more about the host city, Seattle.

Seattle, Washington sits at one of the most beautiful spots in the United States. Occupying a narrow isthmus between the Puget Sound and Lake Washington, it is the biggest city in the Pacific Northwest, with 780,000 people in Seattle and over four million people in the metro area. Seen from above, carpets of evergreen trees, pristine blue waters, and snowy white mountains surround the downtown's metallic skyscrapers, earning the city its nickname The Emerald City.