17th Lake Union 10K Run/Walk

The 17th Lake Union 10K Run/Walk on Sunday August 9th, 2026 in Seattle, Washington, United States is a beloved community event that has been part of the city's summer calendar for years. On race day, runners will find themselves amid the vibrant backdrop of Lake Union Park, known for its picturesque views and bustling activity. As late July transitions into early August, expect a comfortable temperature range with an average high in the mid-20s Celsius, making it a pleasant morning run through the city's green spaces.
The event has grown from a small local gathering to one that attracts participants not just within Seattle but across Washington State and beyond. With a rich history dating back to 2010, this race continues to uphold its tradition of supporting local charities while fostering community spirit among runners and walkers alike. This year's edition expects over 3000 participants who will gather in the heart of Seattle for what promises to be another memorable run.
Course details reveal a challenging yet enjoyable journey through Lake Union Park’s varied terrain. Runners start at the picturesque Lake Union Park, near MOHAI, where they are greeted by clear blue skies and lush greenery. The 10K course is laid out on hard and dry surfaces, offering a steady pace with some gentle elevation changes that add to the overall experience. Key points along the route include several aid stations providing water and snacks, ensuring runners stay hydrated throughout.
As runners progress through the course, they will pass by various landmarks such as the Seattle Aquarium and the Center for Urban Waters, all while enjoying views of the surrounding cityscape. The race concludes back at Lake Union Park where a finish line celebration awaits with plenty of post-race refreshments and entertainment.

Logistics for this year’s event are straightforward. Interested participants can register online through https://runsignup.com/Race/WA/Seattle/LakeUnion10K, which opens on January 11, 2026. Fees include a $40 entry fee that supports the race's charitable cause and a $10 optional shirt fee for those who want to be fully geared up.
Race bibs can be picked up at Lake Union Park starting from August 8th, between 3 PM and 7 PM or on race morning from 6 AM until shortly before the start. Participants are encouraged to arrive early to ensure a smooth registration process. The event is open to runners of all ages with no minimum age requirement but recommends participants be at least 14 years old for solo entry.
For first-time participants, we provide easy-to-follow instructions and welcome tips from veteran runners who can offer advice on the course layout and weather conditions. Come ready in comfortable running gear; expect typical August temperatures to range between a low of about 59°F (15°C) and a high of around 76°F (24°C), with humidity levels typically hovering at 69%.