0019

Half Marathons Found In Washington in August

View all ↓

Half Marathons in Washington in August 2025

Find A Race is the US's favourite event listings site. Check out our list of August 2025 Half Marathons in Washington below.

Race Calendar: Half Marathons Found In August

🚀Boosted

The Cookie Dash Run 5K/10K/13.1 SEATTLE

Seattle, Washington
16 Aug 25
$32.80 - $48.70
🚀Boosted

Sunrise Marathon 5K/10K/13.1 SEATTLE

Seattle, Washington
30 Aug 25
$32.80 - $52.94
Feature your event at the top of the results

Want more bookings?

Our most effective tool for getting more people to your race is a ‘Boost’. Boosts put your event to the top of the search results.

Typically a Boosted event gets 8x as many Impressions, 4x as many Clicks and generates 4x more revenue than a standard event listing.

Choose to Boost your event on the landing page which best suits your target audience and budget. For example, ‘10k’s near San Francisco or ‘marathons in April’. Our team can advise on scheduling promotions to optimize performance.

Prices start at $100 per month. The most popular categories sell out in advance so booking early is recommended.

Get in touch

Hi, I'm Rosie from findarace.com!

If you're looking to boost your event or have any questions, please fill in your details below and I'll be in touch to help you.

Singles & Friends Running Club 5K/10K/13.1 SEATTLE

Seattle, Washington
02 Aug 25
$32.80 - $52.94

Galloping Gertie

Gig Harbor, Washington
02 Aug 25
$76.26 - $118.66

Ninja 5K, 10K, & Half Marathon at Heritage Park, Olympia, WA (31) 80

Olympia, Washington
02 Aug 25
$33.05 - $70.15

Ninja 1M, 5K, 10K, 15K, & Half Marathon at Langus Riverfront Park, Everett, WA (31) 80

Everett, Washington
02 Aug 25
$27.75 - $70.15

Run for Coffee Lovers 5K/10K/13.1 SEATTLE

Seattle, Washington
02 Aug 25
$32.80 - $52.94

Ninja 5K, 10K, & Half Marathon at Heritage Park, Olympia, WA (32) 80

Olympia, Washington
09 Aug 25
$33.05 - $70.15

Race the Reserve Whidbey Island

Coupeville, Washington
09 Aug 25
$43.40 - $91.10

Twilight at the Bay

University Place, Washington
16 Aug 25
$76.26 - $118.66

Ninja 1M, 5K, 10K, 15K, & Half Marathon at Chiawana Park, Pasco, WA (33) 30

Pasco, Washington
16 Aug 25
$27.75 - $70.15

Run for Mental Health 5K/10K/13.1 SEATTLE

Seattle, Washington
16 Aug 25
$32.80 - $48.70

Ninja 1M, 5K, 10K, 15K, & Half Marathon at Lowell Riverfront Park, Everett, WA (33) 80

Everett, Washington
16 Aug 25
$27.75 - $70.15

The Cookie Dash Run 5K/10K/13.1 SEATTLE

Seattle, Washington
16 Aug 25
$32.80 - $48.70

Ninja 5K, 10K, & Half Marathon at Liberty Park, Spokane, WA (34) 20

Spokane, Washington
23 Aug 25
$33.05 - $70.15

Ninja 5K, 10K, 15K, & Half Marathon at Heritage Park, Olympia, WA (34) 150

Olympia, Washington
23 Aug 25
$33.05 - $70.15

Tacoma Narrows Half Marathon / 5K

Tacoma, Washington
23 Aug 25
$59.80 - $123.40

Iron Horse Half Marathon

North Bend, Washington
24 Aug 25
$56.73 - $111.81

Medal Madness 5K, 10K, & Half Marathon at Heritage Park, Olympia, WA (35)

Olympia, Washington
30 Aug 25
$33.05 - $70.15

Labor Day Run 5K/10K/13.1 SEATTLE

Seattle, Washington
30 Aug 25
$32.80 - $52.94

Sunrise Marathon 5K/10K/13.1 SEATTLE

Seattle, Washington
30 Aug 25
$32.80 - $52.94
Showing 1-19 of 19 results

Win
every
month

Sign-up to our email newsletter and you'll be automatically entered into a monthly prize draw to win running kit, from award-winning tech to the latest running shoes. This month it's the Shokz OpenRun Pro 2 headphones worth $180

By signing up you agree to our privacy policy and terms

Image: © Shokz