Once in a Blue Moon 5K. 10K. Half Marathon

Get ready for a truly extraordinary running experience at the Once in a Blue Moon 5K, 10K, and Half Marathon on Sunday, May 31, 2026, in beautiful Long Beach, California. This unique event is timed to coincide with an actual "Blue Moon," offering runners a rare opportunity to chase miles and create unforgettable memories under the glow of a celestial phenomenon that only occurs every few years. Hosted by Califlow Runs, known for their professional execution and vibrant community atmosphere, this race promises high vibes and a celebration of uncommon moments.

Participants in all three distances – 5K, 10K, and the challenging 13.1-mile Half Marathon – will enjoy a flat, fast, and scenic coastal course. The routes wind along picturesque beachside pathways, parks, and riverways, providing breathtaking ocean views throughout. Half Marathoners, in particular, will be treated to spectacular oceanfront vistas, passing iconic Long Beach landmarks such as the Queen Mary, the Aquarium of the Pacific, and Shoreline Village, with a minimal highest elevation of just 45 feet. Aid stations, complete with water and restrooms, will be conveniently located along the route to support every runner.

Starting and finishing at Granada Beach, the event ensures a festive atmosphere with chip-timed results, free race-day photos, and custom finisher medals for all participants. Typical race day conditions in late May offer ideal running weather, with comfortable highs around 74°F and lows around 60°F, accompanied by a mere 1% chance of precipitation. Whether you're a seasoned runner aiming for a personal best or looking to enjoy a memorable coastal stroll, the Once in a Blue Moon race is an inclusive event for all paces and backgrounds, promising an experience you'll truly remember.