The Worm Moon, which marks the last Full Moon of the winter shows up officially tomorrow morning, Tuesday March 7th at 5:40 a.m. NM Time. The Spring Equinox will formally arrive a little less than two weeks later, at 3:24 p.m. Mountain Time on March 20. Some call this the Worm Moon because it appears at the same time as the first signs that earthworms are emerging through the dirt.