The full moon closest to March 20, 2025, will occur on March 14, 2025, known as the Worm Moon. On March 20, 2025, the moon will be in the Waning Gibbous phase with about 67% illumination, which is just a few days after the full moon phase.
So, there is no full moon exactly on March 20, 2025; the full moon happens about six days earlier on March 14.