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Races in Seatac, WA

Running races in or near Seatac, WA

Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more

See below for a frequently-updated, comprehensive list of upcoming running events in the local Seatac, WA area. Races listed here include both walking and running events of various distances — from 1-milers, to 5Ks, to marathons, and everything else in between.

Road Runner Sports

Running - Maple Valley 10k

Organization: Sammamish Running

Date of Race: 09-14-2025

Description: Join is for a late summer Half 13.1, 10k, 5k trail ...

Running - Maple Valley 5k

Organization: Sammamish Running

Date of Race: 09-14-2025

Description: Join is for a late summer Half 13.1, 10k, 5k trail ...

Running - Maple Valley Half 13.1

Organization: Sammamish Running

Date of Race: 09-14-2025

Description: Join is for a late summer Half 13.1, 10k, 5k trail ...

Puzzle Palooza! Puzzle Competition-Summer Fun!

Organization: Pierce County Parks

Date of Race: 08-09-2025

Description: DescriptionHave a passion for jigsaw puzzles? Are you a little competitive? ...

Seattle Waterfront 10k/5k Race - 10k

Organization: Sammamish Running

Date of Race: 07-19-2025

Description: Come out and race on the new Seattle Waterfront. Flat and ...

Bubble Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...

Organization: Viral Run

Date of Race: 08-03-2025

Description: If you’ve done a traditional 5K, you know they ...

Bubble Run | Seattle

Organization: Viral Run

Date of Race: 08-03-2025

Description: If you’ve done a traditional 5K, you know they ...

Muddy Dash - Exclusive VIP Registration - R̶e̶g̶u̶l̶a̶r̶ ...

Organization: Viral Run

Date of Race: 07-26-2025

Description: Muddy Dash is not your average mud run! Get ready for ...

Bubble Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶

Organization: Viral Run

Date of Race: 08-03-2025

Description: If you’ve done a traditional 5K, you know they ...

Seattle Waterfront 10k/5k Race - 5k

Organization: Sammamish Running

Date of Race: 07-19-2025

Description: Come out and race on the new Seattle Waterfront. Flat and ...

Maple Valley Half 13.1, 10k/5k

Organization: Sammamish Running

Date of Race: 09-14-2025

Description: Join is for a late summer Half 13.1, 10k, 5k trail ...

Seattle Waterfront 10k and 5k

Organization: Sammamish Running

Date of Race: 07-19-2025

Description: Come out and race on the new Seattle Waterfront. Flat and ...

Muddy Dash - Value Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶7̶4.9̶5̶

Organization: Viral Run

Date of Race: 07-26-2025

Description: Muddy Dash is not your average mud run! Get ready for ...

Muddy Dash | Seattle

Organization: Viral Run

Date of Race: 07-26-2025

Description: Muddy Dash is not your average mud run! Get ready for ...

Puzzle Palooza! Puzzle Competition-Ugly Sweater Edition!

Organization: Pierce County Parks

Date of Race: 12-06-2025

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

MAPS Rahma Quran Academy: Sisters Tajweed

Organization: MAPS-Redmond

Date of Race: 09-09-2025

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Beaver Lake Triathon 2025

Organization: Sammamish Running

Date of Race: 08-24-2025

Description: Race starts promptly at 8 am at the Beaver Lake beach ...

Zombie Run 5K

Organization: Pierce County Parks

Date of Race: 10-11-2025

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Camps - 2025

Organization: South Sound Cross Country Camp

Date of Race: 07-21-2025

Description: The South Sound Cross Country Camp in an instructional camp for ...

Triathlon-Sprint - Sponsor - Post Race Celebration

Organization: Sammamish Running

Date of Race: 08-24-2025

Description: Race starts promptly at 8 am at the Beaver Lake beach ...

Triathlon-Sprint - Sponsor - Mile 1 Marker Sponsor

Organization: Sammamish Running

Date of Race: 08-24-2025

Description: Race starts promptly at 8 am at the Beaver Lake beach ...

Triathlon-Super Sprint - Relay - Swim, Bike, Run

Organization: Sammamish Running

Date of Race: 08-03-2025

Description: 1/4 mile swim in Lake Washington, 13k bike on Eastrail, and ...

Soaring Eagle Duathlon

Organization: Sammamish Running

Date of Race: 09-07-2025

Description: Soaring Eagle DuathlonSeptember 7, 2025, 8 am

Triathlon-Sprint - Sponsor Pre-Race Pasta Dinner

Organization: Sammamish Running

Date of Race: 08-24-2025

Description: Race starts promptly at 8 am at the Beaver Lake beach ...

Triathlon-Sprint - Sponsor - T-Shirts

Organization: Sammamish Running

Date of Race: 08-24-2025

Description: Race starts promptly at 8 am at the Beaver Lake beach ...

Lock Laces

Complete list of running events in and near Seatac, WA: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.


More information about Seatac

About Seatac

Seatac (WA) is a city in King County with an estimated population of 26,909.[4]

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The number of U.S. marathon finishers declined from 2014 to 2015 approximately 8 percent.

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