Get ready for a festive dash at the Shamrock 5K/10K and Little Leprechaun Run, set to take place on Saturday, March 14, 2026, in Chesterfield, MO. This annual event, hosted at the Chesterfield Valley Athletic Complex, offers runners the choice of a 5K or 10K distance, alongside a spirited Fun Run for the younger "Leprechauns". The courses are known for being fast and flat, primarily on roads, with a scenic stretch along a levee trail. Both the 5K and 10K races kick off together at 8:30 AM CDT, providing a dynamic start to this community celebration.

Participants will begin with a brief out-and-back section on the road, circling the athletic complex's field and parking lot before heading onto the levee trail; 5K runners will turn left, while 10K participants will turn right, ensuring a smooth flow for both distances. This well-organized event promises a fun atmosphere, making it ideal for both seasoned runners seeking a personal best on its flat terrain and families looking for a lively St. Patrick's Day themed experience. Typical race day conditions in mid-March include comfortable highs around 57°F and lows around 35°F, with only a 15% chance of precipitation, providing pleasant running weather.

Beyond the race itself, all participants who register by the deadline receive a commemorative shirt, and age-category medals are awarded to top finishers in the 5K and 10K. The Little Leprechaun Run ensures every young participant receives a medal, adding to the celebratory spirit. With its inclusive distances and festive theme, the Shamrock 5K/10K and Little Leprechaun Run is more than just a race; it's a cherished annual tradition in Chesterfield, offering a perfect blend of fitness and fun.