
Tenacious 10 is a running race on April 3, 2027 in Seattle, WA.
Join hundreds of runners for Seattle’s most iconic 10K and 10-mile loop around Lake Union. This isn’t just a run—it’s a celebration of everything that makes our city incredible.
Start and finish at Gas Works Park. Cruise past Lake Union Park. Wave to the Space Needle. Conquer the Fremont Bridge.
Chase a PR, run with friends, or just soak it all in—this is one of Seattle’s most scenic and energizing race experiences.
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• Flat, fast, and scenic Lake Union course
• Chip timing with mile splits and live tracking
• Printed finisher cards
• Long sleeve shirt + finisher medal
• FREE professional race photos
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Cross the finish line, grab your medal, and celebrate with your crew.
The pain fades. The photos last forever. The bragging rights? Those are eternal.
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
57°
Typical Low
41°
Chance of Rain
55%
Based on US Climate Normals data from Seattle Sand Pt Wsfo, 4 mi from the venue.
Population
741,440
as of 2023
City Elevation
40 ft
Nearest Airport
SEA
Seattle–Tacoma International Airport · 10 mi
Time Zone
Pacific Time
From Endurance Grid
A big city race. Expect multiple lodging options and plenty to do the day before.
Every finish line starts with a single decision. Claim your spot at Tenacious 10, put it on the calendar, and turn “someday” into a start date.
139
Days to train
Plan your training, log every workout, and track your progress all the way to race day in the Endurance Grid app.


Tenacious 10
Apr 3, 2027