The Bank of America Shamrock Shuffle is Chicago’s spring season opener—a fast, flat 8K race and 2-mile walk through the heart of downtown. Starting and finishing in Grant Park, the course highlights parts of the famed Chicago Marathon route and draws thousands of runners decked in green. With cheering crowds, live music, and a festive vibe, it’s a high-energy kickoff to the city’s racing calendar. As one of the largest 8K races in the world, the Shamrock Shuffle blends big-city racing with a community feel.