Full moons in October: Harvest moon tonight and a rare blue moon on Halloween - CNN

Two full moons will occur in October. October's first full moon is the harvest moon on October 1 and the second full moon will occur on October 31, or Halloween. This second full moon in one month is called a blue moon. https://www.cnn.com/2020/10/01/world/full-moon-harvest-moon-blue-moon-october-2020-scn-trnd/index.html