Summer Trail Series

The Summer Trail Series returns to Ballwin, Missouri on July 2nd, inviting runners of all stripes into the heart of Castlewood State Park for an evening under the summer sun. This series is more than just a collection of races; it’s a tradition that has become synonymous with St. Louis trail running culture. Each Thursday night race unfolds against the backdrop of lush trails and bluffs overlooking the Meramec River, where runners can lose themselves in nature while chasing personal bests.
Castlewood State Park offers an intimate setting for these races, its winding singletrack paths threading through dense forests and across rocky outcroppings that challenge even the most seasoned trail runner. The park’s terrain is varied but largely dry during summer months, providing firm footing as runners navigate twists and turns under a canopy of towering trees. As evening falls early in August, the trails take on a different character, softened by the fading light yet still brimming with potential for adventure.
Over its run, the Summer Trail Series has built up a loyal following among both competitive racers and casual enthusiasts alike. Participants can look forward to five distinct races spread across July and into August, each one offering unique challenges and opportunities to earn points toward overall series awards. The Frostbite format ensures that even an off night won’t derail your chances of coming out on top—a comforting thought for those with hectic schedules or unpredictable weather conditions.
Castlewood State Park is the venue where every race begins at 6:15 PM sharp, with participants gathering in the Special Events area past the train trestle. The course winds through well-maintained trails that are both challenging and scenic, marked clearly along the way to guide runners as they push their pace under starlit skies or against a backdrop of vibrant summer sunsets. Aid stations dot key points on each route, ensuring hydration and energy replenishment for those long evenings out in the woods.
Runners heading into these races can expect warm temperatures that feel like mid-20s Celsius, with an average humidity level around 73%. While rain is possible, it’s unlikely to be a significant factor given typical rainfall of just over four millimeters. The trails themselves are expected to remain firm and dry underfoot, making for reliable footing even as daylight dwindles.

For those looking to register or learn more about the Summer Trail Series, visit [https://runsignup.com/Race/MO/Ballwin/SummerTrailSeries](https://runsignup.com/Race/MO/Ballwin/SummerTrailSeries) where you can find details on registration fees and deadlines. Race day bib pickup is available at Castlewood State Park’s Special Events area starting one hour before race time, requiring only your confirmation email or phone number for verification.
As the Summer Trail Series concludes its final race in Ballwin, Missouri on August 27th, it marks another successful run of evening adventure and camaraderie. Whether you’re chasing points across all five races or simply looking to enjoy a few summer Thursday nights out on the trails with friends, this series offers something special for every runner ready to lace up and explore Castlewood’s hidden gems under the stars.