Ready to tackle a triathlon with serious history? The Heart O' Dixie Triathlon brings you its 47th running on Saturday, June 20th, 2026, in Louisville, MS as part of the Neshoba County Fair—featuring a half-mile swim in Lake Tiak O'Khata, a tough 27-mile bike course heading south on Highway 15 toward Philadelphia, and a 7-mile run finishing on the fairgrounds' horse racing track. This long-established event, which has been going strong since 1980 and ranks among America's oldest triathlons, doubles as an annual fundraiser for The Refuge of MS, so you'll be supporting a great cause while crossing the finish line.