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.
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 ...
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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 ...
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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 ...
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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? ...
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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 ...
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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 ...
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Bubble Run | Seattle
Organization: Viral Run
Date of Race: 08-03-2025
Description: If you’ve done a traditional 5K, you know they ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Muddy Dash | Seattle
Organization: Viral Run
Date of Race: 07-26-2025
Description: Muddy Dash is not your average mud run! Get ready for ...
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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 ...
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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 ...
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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 ...
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Zombie Run 5K
Organization: Pierce County Parks
Date of Race: 10-11-2025
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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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 ...
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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 ...
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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 ...
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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 ...
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Soaring Eagle Duathlon
Organization: Sammamish Running
Date of Race: 09-07-2025
Description: Soaring Eagle DuathlonSeptember 7, 2025, 8 am
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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 ...
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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 ...
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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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Did you know?
The number of U.S. marathon finishers declined from 2014 to 2015 approximately 8 percent.
