The time after the ground thaws to before things green up is the time to burn prairies. Also, the time after the ground thaws and before the trees bud is the time we dig up, transplant, pot, or ball and burlap trees. The window for much of what we do this spring of 2018 is a very small one.
As of yesterday, Saturday May 5, the ground is still frozen in spots. But it's thawed enough for us to do what we need to do.
The burns should be done before the prairie plants green up, as the burn forces them to start over. Unfortunately, during all this, the trees are beginning to bud. Their budding is a function of their activity, and It is not good to disturb tree roots when they become active, as doing so can kill the tree. So disturbing the roots should be done while they are dormant.