Popsugar Living Space When to Watch Every Full Moon in 2021 There Will Be Lots of Full Moons in 2021 — Here's When You Can Catch Them January 8, 2021 by Julia Duda View On One Page Photo 12 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 12 Dec. 18 — Full Cold Moon Finally, by December of 2021, we'll be back in winter, which gives the cold moon its name. You can catch the last full moon of 2021 on Dec. 18! Previous Next Start Slideshow SpaceAstrologyAstronomical Events