Secret City Half Marathon
Oak Ridge's certified lakeside half has doubled in size in five years, running Melton Lake, a working quarry and a quiet tree lined private road.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 28, 2026.
Quick facts
- USA Track and Field certified course, number TN15066MS, run largely along Melton Lake.
- Field has grown from under 300 to more than 600 half marathon finishers.
- Late 9 a.m. start, unusually relaxed for a November road half.
- Flat waterfront start and finish on the Melton Lake Park peninsula.
2026 Secret City Half Marathon registration
Registration for the 2026 Secret City Half Marathon runs through the official registration page at runsignup.com.
About the Secret City Half Marathon
One of the faster autumn halves in east Tennessee, with finishers rising from under 300 to more than 600 in five years. The Manhattan Project history behind the Secret City name gives the event an identity the course itself does not advertise.
Course
Starts on the Melton Lake Park peninsula and runs the waterfront before passing an operational quarry, then follows a serene tree lined private road and winds through Oak Ridge before returning along the water. It is certified as TN15066MS and is widely treated as a PR course.
Race-day weather
Mid November in the Tennessee valley usually starts in the 30s or 40s and finishes near 60. Fog off Melton Lake is common early, and the late 9 a.m. start means the closing miles can feel warm.
Past Secret City Half Marathon dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Saturday, November 14, 2026 | Upcoming | — |
Secret City Half Marathon FAQ
When is the Secret City Half Marathon?
The 2026 Secret City Half Marathon is on Saturday, November 14, 2026.
How do I register for the Secret City Half Marathon?
Register for the Secret City Half Marathon through the official registration link: marathonscout.com/go/secret-city-half-marathon/register. It opens the race registration page at runsignup.com.
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