IRONMAN 70.3 Chattanooga 2027
A 1.4-mile downstream swim in the Tennessee River, a rolling loop through north Georgia under Lookout Mountain, and a two-lap downtown run.
39 weeks to race day: base season
Plenty of runway. This far out, the win is a boring, consistent base rhythm: aerobic volume, strength, technique. The structured block starts closer in; what you do now decides how high it can climb.
Building for this one? 70.3 training plan covers the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.
Start my Road to IRONMAN 70.3 Chattanooga.
Commit to the date and the work gets a shape: your countdown starts, the emails arrive in step with your build, and the app anchors a recovery-led block so the final week lands exactly on race day.
One confirmation email, then the road begins. Registering for the race itself stays with the organiser.
“The swim is a fifth longer than a standard 70.3 swim and still faster, because it is entirely downstream. Do not use your split here to set expectations for a still-water race.”
The race
The course
No course maps for this race. IRONMAN publishes no downloadable route for any leg of this race, only a live tracker that runs on race day, so there is nothing to draw a course map from. Everything below comes from the official course page, checked on the date at the foot of this section.
Note the distance: 1.4 miles, not the usual 1.2. The course is longer than standard because it runs straight downstream with the current, so the split still comes out fast. Rolling start, exit at Ross's Landing, spectators on the Veterans and Market Street bridges.
Eleven miles south out of town, then a 34-mile loop through north Georgia running parallel to Lookout Mountain on good road surfaces, coming back through historic Chickamauga.
Two loops through downtown, the Tennessee Riverwalk, Veterans Bridge and the North Shore, finishing at Ross's Landing. The official course page still carries a construction notice about the Walnut Street Bridge written for the 2026 edition, on a page now advertising 2027, so treat the bridge crossing as unconfirmed until they update it.
Not yet confirmed for this edition: bike elevation gain, transition locations, cut-off times, water temperature history, whether the run still crosses the Walnut Street Bridge. We publish these only once they are on the official course page, so check there before you pace off anything here.
Course details verified against the official IRONMAN 70.3 Chattanooga course page on 14 August 2026. Courses change; the official page is always the last word.
Questions, answered
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What is the swim like?
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Read before you race
Race Week Is Where People Unravel.
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Photograph of Chattanooga, Tennessee, USA: James Pressley, CC BY-SA 3.0, via Wikimedia Commons. Not official race photography.
This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by IRONMAN 70.3 Chattanooga or its organiser. Details are based on publicly available information; names are used descriptively to identify the event. For accurate, up-to-date information and to enter, always use the official event website.