The Rock the Loch 5K/10K/Half Marathon (LIVE or Virtual)

Prepare to embark on an unforgettable running adventure at The Rock the Loch 5K/10K/Half Marathon, taking place live at the stunning Lake Chabot Regional Park in Castro Valley, CA, from June 26-29, 2026. This event, also offering a virtual participation option, promises a unique blend of "nature therapy" and exhilarating challenge across all distances. Runners can expect typical race day conditions in late June, with comfortable highs around 76°F and lows near 57°F, alongside a delightful 0% chance of precipitation, ensuring ideal running weather.

The Rock the Loch boasts a diverse and scenic course for every runner. The 5K is a fast, 100% paved route, perfect for those chasing a personal best or tackling their first race. The 10K offers a balanced experience with a 50% paved and 50% trail mix, including one "tough climb" that makes it an excellent choice for runners looking to transition to trail running. For the seasoned trail enthusiast, the Half Marathon presents a "STOUT challenge," featuring roughly three miles of pavement and the remainder on trails, with nearly 1,700 feet of ascent and descent, all set against a backdrop of incredible views along the shoreline of Lake Chabot. Aid stations are strategically placed; the 10K has one around mile 3, while half marathoners will find support at approximately 4.1, 7.65, and 9.85 miles. These stations are well-stocked with water, Skratch Labs electrolyte drink, GU Energy products, Saltstick products, chips, and pretzels to fuel your journey.

Beyond the picturesque trails, The Rock the Loch is renowned for its vibrant atmosphere and exceptional runner perks. All live participants receive an awesome lifestyle tee, a handcrafted race "woodallion" (which doubles as a bottle opener!), and a custom Rock the Loch beer sampler stein. The festivities continue post-race with DJ Cryptid spinning tunes, quality snacks like Bellwether Farms yogurt and Jambars, and access to a celebratory "BREWFEST". While organizers can't guarantee a sighting of cryptic aquatic creatures at "Loch Chabot," they do promise a gorgeous trail run and an unforgettable experience at this East Bay gem.