Lace up your shoes for the Brea Reservoir parkrun, a vibrant 5K community event taking place on June 20, 2026, in Fullerton, CA. This free, volunteer-led run offers a refreshing start to your Saturday, welcoming runners, joggers, and walkers of all abilities. The course itself presents a unique challenge and scenic beauty, featuring an out-and-back route that begins and ends atop the Brea Reservoir Dam Wall. Participants will journey east into the "Fullerton lost trail," experiencing a dynamic mix of asphalt and packed dirt paths. While the course is clearly marked, be prepared for some elevation changes, including a "short but tiring Dam climb" that adds an engaging element to your 3.1 miles.

Expect typical race day conditions for mid-June in Fullerton, with comfortable highs around 82°F and lows around 63°F, and a 0% chance of precipitation, creating ideal weather for an enjoyable outing. The Brea Reservoir parkrun is renowned for its friendly and inclusive atmosphere, drawing both local participants and visiting runners from across the globe. Runners consistently praise the supportive volunteers who make the event possible each week. Following your effort, many participants gather for a post-parkrun coffee at Coffee Up Roastery, fostering a strong sense of community and camaraderie. This weekly gathering is more than just a run; it's a chance to connect, stay active, and embrace the outdoors in a welcoming environment.