Secret City Half Marathon
Race Day Weather
Cool start, mild finish
Runners will face a temperature range from 40°F at the start to 59°F by the finish, with average humidity at 55%. Wind will be light from the SSW at 5 mph, making it a non-factor. With cool conditions, maintaining a steady pace throughout is advisable, avoiding overheating as temperatures rise.
Pace Calculator
Get forecast alerts for Secret City Half Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Secret City Half Marathon and 5K takes place each November in Oak Ridge, Tennessee, a city built in secrecy during World War II for the Manhattan Project. Both courses start and finish at the Melton Lake Park peninsula. The half marathon runs along Melton Lake, past an operational quarry, and down a tree-lined private road before returning along the water to the finish. The 5K stays along the Melton Lake walking trail out to Elza Gate Park and back.