when to see blue moon

The next Blue Moon will be on May 31, 2026, which is a calendrical Blue Moon (the second full moon in a single calendar month). The next seasonal Blue Moon (the third full moon in an astronomical season that has four full moons) will be on May 20, 2027. Blue Moons typically occur every 2.5 to 3 years. Despite the name, a Blue Moon is not actually blue in color; any blue tint is due to rare atmospheric conditions rather than the moon's phases or position in the sky.