Get ready for a spooktacular challenge at the MonsterDash Run - Louisville, hitting the trails on October 25, 2026, in scenic Louisville, CO. This annual event is renowned as one of Colorado's favorite Halloween runs, consistently delivering a unique and festive atmosphere for both 10K and 5K runners, as well as a dedicated Kids 1 Mile Race. Expect typical race day conditions with highs around 63F and lows near 35F, and only a 7% chance of precipitation, making for ideal running weather. The course itself is a highlight, offering a fast and flat trail experience that starts and finishes at Louisville Community Park. The 5K follows a flat, fast loop heading west, while the 10K expands into a figure-eight course that includes some challenging hills and excellent views as it extends east towards Lafayette before rejoining the flatter 5K loop. Both distances are welcoming to strollers and dogs, emphasizing wide, easy-to-maneuver trails.

What truly sets the MonsterDash Run apart is its immersive, ever-changing Halloween theme, which for recent years has embraced a "Scary Clowns / Circus Theme". This commitment to fun is evident in the vibrant race expo at Community Park, featuring scary music, numerous blow-ups and monsters, carnival games, and even opportunities to take photos with a giant astronaut or inside a 15' UFO. A significant portion of runners – often over 70% – embrace the spirit by coming in costume, vying for prizes in categories like Best Family, Most Unique, and Best Clowns. Aid stations on the course provide water and sports drinks, with the 5K offering a water stop hit twice if needed.

The MonsterDash Run is a true family affair, fostering a festive post-race celebration complete with hot dogs, popcorn, cotton candy, and even a pie-eating contest. Runners receive a collector's bib, a distinctive finisher medallion matching the yearly theme, and a breathable running hat. Keep an eye out on the course for hidden clowns or other themed items, as finding and bringing them to the finish line can earn you special prizes. With its lively atmosphere, unique course features, and dedication to Halloween fun, the MonsterDash Run promises an unforgettable race day experience for all ages and paces.