A Blue Moon happens approximately once every 2.5 to 3 years. The next Blue Moon will occur on May 31, 2026. There are two types of Blue Moons:

• A monthly Blue Moon, which is the second full moon in a single calendar month.
• A seasonal Blue Moon, which is the third full moon in an astronomical season that has four full moons.

The next Blue Moon on May 31, 2026, will be a monthly Blue Moon, and the next seasonal Blue Moon will happen on May 20, 2027. Blue Moons are rare occurrences due to the lunar cycle and calendar timings, but they are not related to the Moon's color, which usually remains pale gray or white.