In 2018, the winter solstice arrives on Friday, December 21, at 5:23 pm EST.
Coincidentally, December’s full Moon—the Full Cold Moon—will also appear on the night of the 21st, though it will not be at its absolute peak until the next day. So, keep your eyes peeled for a (near) Winter Solstice Full Moon that night! (Believe it or not, the next full Moon to actually peak on the winter solstice won’t be until 2094!)