A blue moon is the second full moon that occurs within a single calendar month, not an actual blue-colored moon. Despite its name, it is not blue but rather rare, occurring only once every two to three years. The next blue moon will be the Sagittarius Blue Moon on Sunday, May 31, 2026, which will be the only blue moon of that year.
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Deep Dive
Once in a Blue Moon — literally, this SundayAdded:
Once in a blue moon.
You've said it your whole life.
A way of saying almost never.
But here's what nobody tells you.
It's a real thing.
The second full moon in a single month.
Not blue, just rare.
Once every two to three years.
The next one is Sunday.
So this weekend when you say once in a blue moon, you can mean it.
The Sagittarius blue moon. The only one of 2026.
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