When Is May 2026’s Blue Moon? Here’s Why It’s a Rare Occurrence — and a Micromoon

An event that occurs once in a blue moon is coming up on the final day of May. The second full moon of the month will be on May 31 and is known as the blue moon. It follows a dazzling flower moon that lit up the sky on May 1. The blue moon, which has provided names for everything from the classic song “Blue Moon” to the nickname of All-Star pitcher Johnny Lee “Blue Moon” Odom to the Oscar-nominated Ethan Hawke movie “Blue Moon” only comes along every two or three years.

When Is May 2026’s Blue Moon? Here’s Why It’s a Rare Occurrence — and a Micromoon. An event that occurs once in a blue moon is coming up on the final day of May. The second full moon of the month will be on May 31 and is known as the blue moon. It follows a dazzling flower moon that lit up the sky on May 1. The blue moon, which has provided names for everything from the classic song “Blue Moon” to the nickname of All-Star pitcher Johnny Lee “Blue Moon” Odom to the Oscar-nominated Ethan Hawke movie “Blue Moon” only comes along every two or three years. Here’s what to know about the upcoming blue moon, which also is what is known as a “micromoon.” When Is the Best Time to Watch May’s Blue Moon? The blue moon will reach peak fullness at 4:45 a.m. ET on May 31, astronomer Catherine Pilachowski tells TODAY.com. That means any time late on May...