A “super blue moon” is very rare, happening on average about once every 10 years, though the gap between them can range from just a few years to as long as about 20 years.

What is a super blue moon?

  • Blue moon : A blue moon is when there are two full moons in a single calendar month, which happens roughly every 2–3 years.
  • Supermoon : A supermoon is a full moon that occurs near its closest point to Earth in its orbit (perigee), so it looks slightly bigger and brighter; about 25% of full moons are supermoons, occurring 3–4 times a year.
  • Super blue moon : Combine both—second full moon in a month that also happens to be a supermoon—and you get a super blue moon.

How often do super blue moons occur?

  • NASA notes that the time between super blue moons is irregular: sometimes they can be separated by up to 20 years.
  • On average, though, they work out to about once per decade (around every 10 years).
  • Occasionally, they can even occur twice within just a couple of months (for example, as a pair in January and March of 2037).

Recent and upcoming examples

  • A widely talked‑about super blue moon occurred on August 30–31, 2023.
  • The next pair of super blue moons is expected in January and March 2037, illustrating how they can sometimes cluster rather than being evenly spaced.

In practical terms: if you see a headline about a “super blue moon,” it’s genuinely a special sight—you might not get another one for roughly a decade.

TL;DR: Super blue moons are a rare overlap of two already uncommon events and typically show up about once every 10 years, though the exact timing can vary a lot.

Information gathered from public forums or data available on the internet and portrayed here.