Summer Splash Prairie Dog Half, 10k, & 5k

Lace up for an invigorating summer challenge at the Summer Splash Prairie Dog Half, 10k, & 5k on Saturday, July 18, 2026, in scenic Castle Rock, Colorado. This popular event, a highlight of the Prairie Dog Half race series, offers distances for every runner, from a fun 5k to a rewarding half marathon. The course primarily takes runners along the East Plum Creek Trail, a 100% concrete path that promises a smooth yet engaging experience. Expect "some hills" throughout, with a notable challenging section in the first and last 1.5 miles of the half marathon, adding an exciting element to your run. The out-and-back design allows you to cheer on fellow participants while enjoying the natural sounds and potential sightings of prairie dog towns along the way.

Runners can anticipate typical race day conditions with highs around 86F and lows near 58F, accompanied by a low 10% chance of precipitation, making for a warm but generally clear summer morning. The race is known for its well-organized, low-key atmosphere and awesome volunteers. Aid stations are strategically placed to keep you hydrated and fueled: the 5k offers two water stops, the 10k provides four, and half marathoners will find eight opportunities for water and electrolyte drinks, with energy gels available at miles 5.5 and 6.5. Porta-Johns are located at the start/finish expo and on the half marathon course. Both well-behaved, leashed dogs and children in strollers are welcome to join in the fun, making it a truly inclusive event.

Starting and finishing at Castle View High School (5254 N Meadows Dr, Castle Rock, CO 80109) where ample parking is available, participants will receive a gender-specific performance shirt and a finisher's pint glass, with half marathoners also earning a commemorative medal. The race prides itself on free photo downloads and offers a generous 3-hour and 30-minute cut-off time for the half marathon, ensuring a supported experience for a wide range of paces. Reviews praise the "nice local half" experience, friendly atmosphere, and the memorable swag, making the Summer Splash Prairie Dog a fantastic choice for your summer racing calendar.