We did a side-trip in March several years ago. We were in Phoenix for business and went out several days eaerly just to get to the Grand Canyon. We only did the South Rim (the North might have been closed). It was cold and there was snow on the ground but there were a lot of people there! When we got to the business meeting, so many people were jealous that we went to the Grand Canyon first. "why didn't I think of that?" was heard a lot!