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Full Moon Calendars for 1990 through 2050

When is the next blue moon (through 2029)?

Wondering when the next blue moon will occur? Here’s a list of the upcoming blue moons through 2029 along with a look back to the blue moons since 2010.

Photo of the full moon: blue moons future and past looking for when is the next blue moon?

What is a blue moon?

We typically refer to a blue moon as two full moons occurring in the same month. While we think that about the saying “once in a blue moon” as a very rare occurrence, it’s a little more frequently than you realize when you watch the calendar.

How often do blue moons occur?

Generally, a blue moon only occurs about every 2 and a half years. Usually, in the year that a blue moon occurs, there is only 1, but sometimes there are two such as in 2018.

Blue Moons in 2018, a year worth noting

2018 was an unusual blue moon year because two blue moons occurred at the start of the year, in January and March. As a result, February did not have a full moon at all. The lack of a full moon in a month is sometimes referred to as a black moon.

The Seasonal Blue Moon, another blue moon definition

A seasonal blue moon is the third blue moon in an astronomical season when four full moons occur within the season (Spring, Summer, Fall, and Winter). This definition is less commonly used for the blue moon because you need to look closer at the full moon cycles from December of the prior year through December of the fulling year as each winter crosses two calendar years. Astronomical seasons begin with the solstices and equinoxes each year.

The solstices, referred to as the longest or shortest day of the year, means the amount of daylight for that day. Equinoxes are when the light and dark parts of the day are the same length (equal).

  • Spring starts with the spring equinox
  • Summer begins with the summer solstice
  • Fall starts on the fall equinox
  • Winter begins with the winter solstice

The spring equinox is usually March 19th or 20th each year and the summer solstice is around June 20th or 21st. The fall equinox occurs on September 22nd or 23rd and the water solstice is usually on December 21st or 22nd each year.

When is the next blue moon?

There are 4 calendar blue moons coming up between now and 2027 along with 3 seasonal blue moons.

Now that the Halloween Full Blue Moon of 2020 has come and gone, the next blue moon will be a seasonal blue moon on Sunday, August 22, 2021 08:02 EST or 13:02 UTC.

The next calendar blue moon is Friday, August 30, 2023 21:35 EST or August 31, 2023 02:35 UTC.

The dates and times are provided by NASA in Eastern Standard Time (EST) with Daylight Saving Time (DST) for part of the year. Also below is the Universal Time Coordinated (UTC) time. This was previously referred to at Greenwich Mean Time (GMT).

YearMonthBlue Moon DatesUTC Time
2021AugustSunday, August 22, 2021 08:02 EST
(seasonal)
13:02 UTC
2023AugustFriday, August 30, 2023 21:35 EST02:35 UTC
(August 31, 2023)
2025DecemberDecember 4, 2025 18:14 EST
(seasonal)
23:14 UTC
2026MaySunday, May 31, 2026 04:45 EST09:45 UTC
2027MayThursday May 20, 2027 06:59 EST
(seasonal)
11:59 UTC
2029AugustThursday, August 23, 2029 21:51 EST
(seasonal)
02:51 UTC
(August 24, 2029)

And when was the last blue moon?

The last blue moon occurred on October 31, 2020 9:49 Eastern Time. It was the only blue moon in 2020.

Looking back from 2020 to 2010, there were 8 blue moons, and two of them were in 2018. 2018 was also an interesting year because February did not have a full moon (sometimes called a black moon).

Blue moons did not occur in 2010, 2011, 2015, or 2017.

YearMonthDay of the weekPast Blue Moons
2020OctoberSaturdayOctober 31, 2020 09:49 EST
2019MaySaturdayMay 18, 2019 17:11 EST
(seasonal)
2018JanuaryWednesdayJanuary 31, 2018 08:27 EST
2018MarchSaturdayMarch 31, 2018 08:37 EST
2015JulyFridayJuly 31, 2015 06:43 EST
2012AugustFridayAugust 31, 2012 09:58 EST

Future Full Moon Calendars

  • Full moon calendar for 2021
  • Full moon calendar for 2022
  • Full Moon Calendar for 2023
  • Full Moon Calendar for 2024
  • Full Moon Calendar for 2025
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Last Updated on December 29, 2020 ·

About Cara

Hello and welcome to FullMoonology, a blog dedicated to the full moon. Why you ask? Because I've been fascinated with the full moon for years and knowing when one is coming up helps explain the odd things that usually happens.

« Full Moon November Calendar for 2021, The Beaver Moon
Full Moon Calendar 2008 »

Welcome to Fullmoonology

Hello and welcome to FullMoonology, a blog dedicated to the full moon. Why you ask? Because I've been fascinated with the full moon for years and knowing when one is coming up helps explain the odd things that usually happens. Read More…

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Full Moon Calendars

  • Full Moon Calendar 2020
  • Full Moon Calendar 2021
  • Full Moon Calendar 2022
  • Full Moon Calendar 2023
  • Future Full Moon Calendars

Full Moons by Month

  • January, Full Wolf Moon
  • February, Full Snow Moon
  • March, Full Worm Moon
  • April, Full Pink Moon
  • May, Full Flower Moon
  • June, Full Strawberry Moon
  • July, Full Buck Moon
  • August, Full Sturgeon Moon
  • September, Full Corn Moon
  • October, Full Hunter’s Moon
  • November, Full Beaver Moon
  • December, Full Cold Moon

Special Moons

  • Next Blue Moon

Past Full Moon Calendars

  • Full Moon Calendar 2019 with 12 full moons
  • Full Moon Calendar 2018
  • All Full Moon Calendars
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