Chesterfield Shamrock 5k/10k & Leprechaun Fun Run

The Chesterfield Shamrock 5k/10k & Leprechaun Fun Run invites runners of all ages and abilities to celebrate St. Patrick's Day weekend with a festive dash through Chesterfield, MO. This annual event, hosted by the City of Chesterfield, takes place on Saturday, March 14, 2026, offering competitive 10K and 5K distances, alongside a delightful 1-mile Leprechaun Fun Run for kids. The races begin and conclude at the Chesterfield Valley Athletic Complex, now known as the Chesterfield First Community Athletic Complex.

Runners can anticipate a fast and flat road course, providing an excellent opportunity for setting personal records or simply enjoying a pleasant morning run. Typical race day conditions in mid-March often bring comfortable highs around 57°F and lows near 35°F, with only a 15% chance of precipitation, creating ideal weather for an enjoyable race. The 5K and 10K races kick off at 8:30 AM, with age category medals awarded to top finishers, while the Leprechaun Fun Run for children starts at 10 AM, ensuring every young participant receives a commemorative medal for their spirited effort. Participants who register by February 22 will also receive a commemorative shirt. This event is a perfect blend of community spirit, fitness, and family fun, promising an unforgettable start to your St. Patrick's Day celebrations.