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Upcoming Half Marathons Near Seattle, WA

Looking for a half marathon in Seattle, Washington? Browse the most comprehensive Seattle half marathon calendar with each race history, course description, difficulty rating, finisher ranges, scenery, and what the race is perfect for like family-friendly or lots of crowd support.

You’ll also be able to find must-know race logistics like pricing, start time, and course maps.

Half marathons are always coming and going. If you don’t see a race on the Seattle half marathon calendar, you can contact us at [email protected].

Filter Washington Half Marathons

Filter Washington Half Marathons

May 31, 2025
100-500 runners
Sammamish, Washington
Lake Wilderness Multisport Half Marathon logo
June 7, 2025
1-100 runners
Maple Valley, Washington
June 7, 2025
1-100 runners
Kent, Washington
June 8, 2025
500-1000 runners
Bainbridge Island, Washington
June 21, 2025
100-500 runners
Seattle, Washington
Tiger Mountain Trail Run 50K Half Marathon 12K & 5K
June 21, 2025
1-100 runners
Issaquah, Washington
June 21, 2025
500-1000 runners
Carnation, Washington
June 28, 2025
1-100 runners
Issaquah, Washington
July 5, 2025
1-100 runners
Bothell, Washington
July 6, 2025
1-100 runners
Seattle, Washington
July 27, 2025
500-1000 runners
Redmond, Washington
August 2, 2025
100-500 runners
Gig Harbor, Washington
August 23, 2025
100-500 runners
Tacoma, Washington
August 30, 2025
1-100 runners
Seattle, Washington
September 1, 2025
100-500 runners
Redmond, Washington
September 6, 2025
500-1000 runners
Carnation, Washington
September 7, 2025
1-100 runners
Gig Harbor, Washington
September 20, 2025
1,000-10,000 runners
Seattle, Washington
October 5, 2025
100-500 runners
Poulsbo, Washington
October 12, 2025
500-1000 runners
Snohomish, Washington

Running in Washington

FAQ

What are the most popular Washington half marathons?

The most popular Washington half marathons are the Seattle Half Marathon with 3,109 finishers in 2023. Followed by the Mount Rainier Half Marathon with 1,391 finishers in 2023.

What are the best Washington half marathons for beginners in 2025?

The Washington half marathons that we recommend most frequently for beginners are the:
Seattle Half Marathon: A large, well produced half marathon with a course around downtown Seattle and Green Lake.
Mount Rainier Half Marathon: A moderate course with 900 ft of elevation gain, with gorgeous views of Mt. Rainier, and a generous four hour time limit.
Iron Horse Half Marathon: A course along Olallie State Park finishing in North Bend with scenery of the river and woods with the entire thirteen miles downhill.

Which months can I run a half marathon in Washington?

You can run a half marathon in Washington in May, June, July, August, September, October, November, and December.

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