Embark on a refreshing summer evening challenge with the Boulder Stroke and Stride Series 5K on June 25, 2026, in beautiful Boulder, Colorado. Celebrating its 25th season in 2026, this popular weekly event at Boulder Reservoir draws 250-400 participants, creating a vibrant and engaging atmosphere for athletes of all levels. Whether you're a seasoned runner or looking for a fast-paced evening outing, this event offers an energetic experience. Typical race day conditions in late June bring highs around 87°F and lows around 54°F, with a low 7% chance of precipitation, providing ideal weather for a scenic run.

The 5K run course is renowned for being "FLAT & FAST," taking participants on an out-and-back journey along the dirt road of the Boulder Reservoir dam. Runners will enjoy breathtaking views of the surrounding snow-capped mountains, adding a picturesque backdrop to their efforts. Aid stations are strategically placed, with at least one available after exiting transition and another around the mile mark, ensuring runners stay hydrated and fueled.

The Boulder Stroke and Stride Series is celebrated for its welcoming environment, offering live timing, delicious post-race food, and series prizes. Participants for the 5K-only event will start at 6:05 PM, following the aquathlon waves. The event is held at Boulder Reservoir, located at 5565 N 51st St, Boulder, CO 80301, and attendees should inform the gate entrance they are there for the Stroke & Stride race. Free clinics are also offered on select dates, including June 25th, providing valuable insights on swim techniques, although the 5K run-only option allows all athletes to participate in this highly regarded local series.