Secret City Half Marathon
Race Day Weather
Cool start, mild finish
Runners will face a temperature rise from 50°F at the start to 56°F by the finish, with light winds from the WSW. Humidity will hover around 57%, making for comfortable conditions. With no significant wind or rain to contend with, pacing can remain steady throughout the race.
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.
