It is spring and time to trim the trees.
But, if yo live in North Branch Minnesota you have about a week to safely do it.
After that time you are in much more danger of disease infecting your trees, especially fruit and ornamental trees.
Not sure if your area is safe to trim, call the DNR or any ag service and they will be able to help you.
I did some trimming on this crab tree 2 weeks ago.