2024, 2027, 2029 and 2032 are years that feature a true Blue Moon based on the original definition of four Full Moons in a season, from an Equinox to a Solstice, or a Solstice to an Equinox. There is a belief that we have 13 Full Moons every year, but the reality is this only happens about every three years as you can see in the tables below..