when will the blue moon appear

The next Blue Moon will appear on May 31, 2026. It will be a monthly Blue Moon, which means it is the second full moon occurring in that calendar month. The following seasonal Blue Moon will occur on May 20, 2027. Blue Moons typically happen about once every 2.5 to 3 years, and the term "Blue Moon" refers to the timing of the full moons rather than the moon's actual color in the sky.