Lace up for the Brea Reservoir parkrun, a vibrant weekly 5K community event set against the scenic backdrop of Fullerton, California. Taking place on May 23, 2026, and every Saturday, this free, volunteer-led run offers a refreshing start to your weekend. The accurately measured 5000m course begins and ends on the impressive Brea Reservoir Dam Wall, leading participants on an out-and-back journey into the Fullerton "lost trail." Runners will experience a mix of asphalt and packed dirt paths, with a notable "short but tiring Dam climb" that adds an engaging challenge to the route. Enjoy picturesque views overlooking the valley as you traverse the course, keeping in mind that some sections may have mud or leaves depending on recent weather.

This parkrun is renowned for its welcoming atmosphere, drawing participants from across the globe, including Australia, Canada, and the UK, alongside local enthusiasts. Marshals or clear signage are in place to guide you, and as a shared path event, courtesy to other park users is encouraged for everyone's enjoyment. Typical race day conditions in late May offer pleasant running weather, with highs around 76°F and lows around 60°F, accompanied by a minimal 1% chance of precipitation. After crossing the finish line near the dam wall, the community spirit continues with a post-parkrun coffee gathering at Coffee Up Roastery, offering a perfect opportunity to connect with fellow runners. Whether you're aiming for a personal best, a leisurely walk, or simply looking to volunteer and support the event, Brea Reservoir parkrun provides a fantastic and inclusive experience for all.