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?

The dates and times provided by NASA in the United States Eastern Time are for Eastern Standard Time (EST) and Eastern Daylight Time (EDT) for part of the year in the United States. Also below is the Coordinated Universal Time (UTC) time. Since you may be in a different time zone, the exact dates may shift for your calendar.

When is the next blue moon?

The next blue moon will be a seasonal blue moon on Monday August 19, 2024 because Summer 2024 will have four full moons. The August 19th full moon will be the eighth full moon of 2024. The next blue moon where the month has two full moons will be on Sunday, May 31, 2026.

And when was the last blue moon?

The last blue moon was on August 30, 2023. It was the only blue moon in 2023. And the last seasonal blue moon occurred on August 22, 2021 at 8:02 AM EDT.

What is a blue moon?

A blue moon is typically considered as the second of two full moons occurring in the same calendar month. While you think the saying “once in a blue moon” is a very rare occurrence, it’s a little more frequently than you realize when you watch the calendar.

Another definition of a blue moon refers to 4 full moons occurring during a season. The third full moon in that season is called a seasonal blue moon. These types of blue moons happen even more often.

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.

How often do blue moons occur?

Generally, a blue moon only occurs about every 2 and a half years with 2 full moons in the same month. Usually, in the year that a blue moon occurs, there is only 1, but sometimes there are two such as in 2018 when both January and March had blue moons.

Upcoming Blue Moons 2024 to 2029

In addition to the Blue Moon in 2024, there are 2 calendar blue moons coming up between now and 2029 along with 2 seasonal blue moons.

YearMonthBlue Moon DatesUTC Time
2024AugustAugust 19, 2024 at 2:26 PM EDT (seasonal) 6:26 PM UTC
2026MayMay 31, 2026 at 4:45 AM EDT8:45 AM UTC
2027MayMay 20, 2027 at 6:59 AM EDT
10:59 AM UTC
2028DecemberDecember 31, 2028 at 11:48 AM EST4:48 PM UTC
2029AugustAugust 23, 2029 at 9:51 PM EDT
1:51 AM UTC
(August 24)

Past Blue Moons 2010 to 2022

Looking back from 2010 to 2023, there were 11 blue moons, and two of them were in 2018. 2018 was also an interesting year because February did not have a full moon, which is also referred to as a black moon.

Blue moons did not occur in 2010, 2011, 2015, 2017, or 2022.

YearMonthPast Blue MoonsUTC Time
2023AugustAugust 30, 2023 at 9:35 PM EDT1:35 AM UTC
(August 31)
2021AugustAugust 22, 2021 at 8:02 AM EDT
12:02 PM UTC
2020OctoberOctober 31, 2020 at 10:49 AM EDT2:49 PM UTC
2019MayMay 18, 2019 at 5:11 PM EDT
9:11 PM UTC
2018MarchMarch 31, 2018 at 8:37 AM EDT12:37 PM UTC
2018JanuaryJanuary 31, 2018 at 8:27 AM EDT1:27 PM UTC
2016MayMay 21, 2016 at 5:15 PM EDT
9:15 PM UTC
2015JulyJuly 31, 2015 at 6:43 AM EDT10:43 AM UTC
2013AugustAugust 20, 2013 at 9:45 PM EDT
1:45 AM UTC
2012AugustAugust 31, 2012 at 9:58 AM EDT1:58 PM UTC
2010NovemberNovember 21, 2010 at 12:27 PM EST5:27 PM UTC

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. The January blue moon was on Wednesday January 31, 2018 at 8:27 AM EST and the March blue moon was on Saturday March 31, 2018 at 8:37 AM EDT.

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.

Frequently Asked Questions

Do you have additional questions about blue moons? Here are a few questions and answers to help you.

When was the last Halloween Blue Moon?

The Last Halloween Full Blue Moon was in 2020 on Saturday October 31, 2020 at 10:49 AM EDT. It was the second full moon of the Autumn 2020 season with the October 1st full moon.

When is the next Seasonal Blue Moon?

The next Seasonal Blue Moon will be Monday August 19, 2024. The 2024 Summer season will have 4 full moons with the third full moon of the season being considered a Seasonal Blue Moon. The August 2024 full moon is also called the Full Sturgeon Moon. The four full moons of the Summer 2024 season are: June 21 (June 22 UTC), July 21, August 19, and September 17 (September 18 UTC).

How many blue moons were there in 2020?

In 2020 there was one blue moon that occurred on Saturday October 31, 2020. It was a Halloween Full Blue Moon. It was the second full moon of the Autumn 2020 season with the October 1st full moon.

When is the next blue moon?