Race Discovery
Tenacious 10
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Tenacious 10

Seattle, Washington, United States View on map
Apr 03, 2027 (America/Los_Angeles local time)
Running

About this race

Spring has never felt this good.

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.

⸻

Why You’ll Love It


    •    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

⸻

The Experience

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. 

T10 WEBSITE

Pick your distance

Running

Tenacious 10 mile run

THE COURSES Enjoy the water views, Seattle vibes, the Space Needle, and the Fremont Bridge!

Apr 03, 2027 16.1K 8:00 AM
Closed

Tenacious 10k run

THE COURSES Enjoy the water views, Seattle vibes, the Space Needle, and the Fremont Bridge!

Apr 03, 2027 10K 8:15 AM
Closed

Typical race-day weather

Based on 3 years of Open-Meteo archive data for this event's race dates in Seattle, plus the 3 days either side.

Temp (°C)
Minimum temperature (race-week average) 6.3° / Maximum temperature (race-week average) 12.7°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) 3.3° / Maximum feels like — heat index / wind chill (race-week average) 12.0°
Peak wind (km/h)
Strongest wind of the day (race-week average)
19.1
Precip (mm)
Precipitation over the day (race-week average)
3.6mm
Humidity
Mean relative humidity (race-week average)
77.9%
Sunrise
Sunrise at the start line on April 3, 2027 (PDT)
Sunset
Sunset at the start line on April 3, 2027 (PDT)
Daylight
Hours between sunrise and sunset on race day
12h 58m

The sun rises at 6:43 AM and sets at 7:41 PM local time (PDT) in Seattle on April 3, 2027 — 12h 58m of daylight.

Course

No course map published yet.

The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.

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Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.

  • Entries, prices, waves and inclusions — the event's official registration page
  • Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
  • Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
  • Comparisons and counts — Race Discovery calendar, 133 Seattle events

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