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.
Snoqualmie River Half 13.1, 10k, 5k
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Join us for the Snoqualmie River Half 13.1, 10k, 5k staring ...
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Snoqualmie River - 10k
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Join us for the Snoqualmie River Half 13.1, 10k, 5k staring ...
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Snoqualmie River - Half 13.1
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Join us for the Snoqualmie River Half 13.1, 10k, 5k staring ...
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Snoqualmie River - 5k
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Join us for the Snoqualmie River Half 13.1, 10k, 5k staring ...
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Running-5K - Individual Age group/open
Organization: Lake Wilderness Triathlon
Date of Race: 06-06-2026
Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...
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Running-10K - Individual Age group/open
Organization: Lake Wilderness Triathlon
Date of Race: 06-06-2026
Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...
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Running-Half marathon - Individual Age group/open
Organization: Lake Wilderness Triathlon
Date of Race: 06-06-2026
Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...
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Cedar River Half 13.1, 10k, 5k - 10k
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Dust off those running shoes and get the year started off ...
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Redmond City Marathon 26.2 - Redmond City Full ...
Organization: Sammamish Running
Date of Race: 03-29-2026
Description: Join us for the inauguralrunning of the Redmond Marathon 26.2. Starts ...
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Cedar River Half 13.1, 10k, 5k - Half ...
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Dust off those running shoes and get the year started off ...
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Redmond City Marathon 26.2 - Redmond City Half ...
Organization: Sammamish Running
Date of Race: 03-29-2026
Description: Join us for the inauguralrunning of the Redmond Marathon 26.2. Starts ...
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Foam Glow - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶
Organization: Viral Run
Date of Race: 08-01-2026
Description: Foam Glow 5K™ is a fun filled experience exposing runners to ...
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Bubble Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶
Organization: Viral Run
Date of Race: 08-01-2026
Description: If you’ve done a traditional 5K, you know they ...
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Foam Glow - VIP Registration R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶9̶9̶.̶9̶5̶
Organization: Viral Run
Date of Race: 08-01-2026
Description: Foam Glow 5K™ is a fun filled experience exposing runners to ...
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Lake Wilderness Run
Organization: Lake Wilderness Triathlon
Date of Race: 06-06-2026
Description: Welcome to the 10th annual Lake Wilderness Run!! We're so excited ...
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Redmond City Marathon 26.2
Organization: Sammamish Running
Date of Race: 03-29-2026
Description: Join us for the inauguralrunning of the Redmond Marathon 26.2. Starts ...
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Foam Glow | Seattle 2026
Organization: Viral Run
Date of Race: 08-01-2026
Description: Foam Glow 5K™ is a fun filled experience exposing runners to ...
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Bubble Run | Seattle 2026
Organization: Viral Run
Date of Race: 08-01-2026
Description: If you’ve done a traditional 5K, you know they ...
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Cedar River Half 13.1, 10k, 5k - 5k
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Dust off those running shoes and get the year started off ...
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Bubble Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...
Organization: Viral Run
Date of Race: 08-01-2026
Description: If you’ve done a traditional 5K, you know they ...
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Cedar River Half 13.1, 10k, 5k
Organization: Sammamish Running
Date of Race: 01-24-2026
Description: Dust off those running shoes and get the year started off ...
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Donut Dash 5K
Organization: Pierce County Parks
Date of Race: 06-20-2026
Description: DescriptionWho doesn't LOVE donuts?! Enjoy a donut pit stop on the ...
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Glow Run 5K
Organization: Pierce County Parks
Date of Race: 04-11-2026
Description: DescriptionLight up the night with our electrifying Glow Run at Chambers ...
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No Sun Fun Run (1-31-26)
Organization: Pierce County Parks
Date of Race: 01-31-2026
Description: DescriptionRain, sleet, or snow, the "No Sun Fun Run" will take ...
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Onesie Run 5K
Organization: Pierce County Parks
Date of Race: 02-21-2026
Description: DescriptionSlip into your coziest onesie and hit the course for a ...
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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.
