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-15K - 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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Sammamish City Marathon - 5k (3.1 mi)
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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Soaring Eagle - 25 mile trail race
Organization: Sammamish Running
Date of Race: 05-25-2026
Description: Join us for the United States of America 250th birthday salute ...
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Soaring Eagle - 20 mile trail race
Organization: Sammamish Running
Date of Race: 05-25-2026
Description: Join us for the United States of America 250th birthday salute ...
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Newcastle Beach Half 13.1 - Newcastle Beach 10k
Organization: Sammamish Running
Date of Race: 06-20-2026
Description: Join us for the event of the Summer! Newcastle beach Half ...
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Newcastle Beach Half 13.1 - Virtual Half 13.1, ...
Organization: Sammamish Running
Date of Race: 06-20-2026
Description: Join us for the event of the Summer! Newcastle beach Half ...
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Half Sam - 13.1
Organization: Sammamish Running
Date of Race: 08-23-2026
Description: One of the fastest and flattest coures in the region. Come ...
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Sammamish City Marathon
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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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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Sammamish City Marathon - Half 13.1
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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Sammamish City Marathon - Kids Race - 2 ...
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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Sammamish City Marathon - 10k (6.2 mi)
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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Newcastle Beach Half 13.1 - Sponsor
Organization: Sammamish Running
Date of Race: 06-20-2026
Description: Join us for the event of the Summer! Newcastle beach Half ...
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Half Sam - 5k
Organization: Sammamish Running
Date of Race: 08-23-2026
Description: One of the fastest and flattest coures in the region. Come ...
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Half Sam - Virtual Sam
Organization: Sammamish Running
Date of Race: 08-23-2026
Description: One of the fastest and flattest coures in the region. Come ...
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Newcastle Beach Half 13.1, 10k, 5k
Organization: Sammamish Running
Date of Race: 06-20-2026
Description: Join us for the event of the Summer! Newcastle beach Half ...
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Soaring Eagle - 10 mile trail race
Organization: Sammamish Running
Date of Race: 05-25-2026
Description: Join us for the United States of America 250th birthday salute ...
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Sammamish City Marathon - Full 26.2
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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Half Sam - 10k
Organization: Sammamish Running
Date of Race: 08-23-2026
Description: One of the fastest and flattest coures in the region. Come ...
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Half Sam - Sponsor
Organization: Sammamish Running
Date of Race: 08-23-2026
Description: One of the fastest and flattest coures in the region. Come ...
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Newcastle Beach Half 13.1 - Newcastle Beach Half ...
Organization: Sammamish Running
Date of Race: 06-20-2026
Description: Join us for the event of the Summer! Newcastle beach Half ...
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Newcastle Beach Half 13.1 - Newcastle Beach 5k
Organization: Sammamish Running
Date of Race: 06-20-2026
Description: Join us for the event of the Summer! Newcastle beach Half ...
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Half Sam
Organization: Sammamish Running
Date of Race: 08-23-2026
Description: One of the fastest and flattest coures in the region. Come ...
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Sammamish City Marathon - Sponsor
Organization: Sammamish Running
Date of Race: 10-24-2026
Description: Join us for the Sammamish City Marathon. New ...
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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?
Historically, more marathons are run in the month of October than any other month (in the U.S.).
