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How often does a blue moon occur?

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Quick Answer

A blue moon is the second full moon in a calendar month and occurs roughly once every 2.7 years, according to Space.com. The term is used in the English language to refer to something that happens infrequently; it is said to occur "once in a blue moon."

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Full Answer

A full moon during any month may appear to the naked eye to take on a slight blue tinge if there has recently been a forest fire or volcanic eruption near the viewing area. This effect is caused by smoke and ash in the atmosphere and does not represent the actual color of the moon.

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