I would say yes according to Squam Lakes Association who have closed the parking area to Mounts Morgan/Percival and West Rattlesnake trails. They have posted if you want to hike the trails, you must walk through all the puddles and mud [not avoid them].
The traditional GMC closure begins 4/15, but this year is a peculiar case. Practically speaking, mud season is entering full swing a few weeks ahead of schedule. Folks should please try to stay off sensitive trails.