April 4, 2026 
Gas Works Park
Seattle, WA

Seattle’s
10 Mile & 10K Run
Around Lake Union

🔥 Nearly 1200 Runners Registered

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Race Details

Runners passing the Space Needle and crossing Fremont Bridge during the Tenacious 10 race in Seattle

Location
Gas Works Park – Seattle

Date
April 4, 2026

Distances
10 Mile & 10K

Start Time
8:00 AM

The Tenacious 10 is a Seattle running event featuring a 10 mile race and 10K around Lake Union, starting and finishing at Gas Works Park in Seattle, Washington.

Experience the Tenacious 10

Seattle’s Most Iconic Loop

Run a 10 mile or 10K loop around Lake Union with unbeatable views of the Seattle skyline, Gas Works Park, and the Fremont Bridge. Flat, fast, and built for PRs or your next great race day.

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Race Details

Runners racing during the Tenacious 10 around Lake Union in Seattle

✔ Scenic Lake Union course
✔ iconic Seattle views
✔ Professionally timed by Laurel Race
✔ Mile split tracking
✔ Printed finisher result cards
✔ Custom finisher medal and race shirt
✔ Post-race celebration-Gas Works Park
✔ Friendly, well-supported race
✔ Experienced race management

Run the Lake Union Loop

The Tenacious 10 features a scenic course circling Lake Union with views of the Space Needle, Fremont Bridge, and the Seattle skyline. The flat and fast route makes it ideal for both experienced racers and first-time runners.

View the Tenacious 10 Lake Union Course
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See You at the Tenacious 10

The Tenacious 10 is a popular Seattle 10 mile race and 10K that takes runners on a scenic loop around Lake Union. Starting and finishing at Gas Works Park, the course offers views of the Space Needle, Fremont Bridge, and the Seattle skyline. Known for its flat and fast route, the Tenacious 10 has become a favorite Seattle running event for both experienced racers and first-time runners.

April 4, 2026
Gas Works Park • Seattle

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Tenacious 10 is a Seattle 10 mile race and 10K around Lake Union, starting and finishing at Gas Works Park in Seattle, Washington.

Group of runners participating in a marathon or race outdoors with the Space Needle in Seattle, Washington visible in the background.
A woman running in a race wearing a black sleeveless top, red shorts, black gloves, a sports watch, and a race bib numbered 1377, with other runners and green bridge structures in the background.
A group of people participating in a marathon or running event on a city street, with two men in the foreground wearing bib numbers 1121 and 1128, and several others behind them, some wearing athletic gear and race bibs, with city buildings and a bri
Group of runners participating in a race on a city bridge, wearing numbered race bibs, including a man in a blue jacket and sunglasses, a woman in black with sunglasses, and a young girl in a pink jacket with a gray cap, with urban buildings in the b
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