Here in Pennsylvania it is a gamble to plant before Mothers Day. With the winter we’ve had even that might be too soon! Here’s a good tomato planting tip if you are using starter plants 6” or so; trim all but the top leaves and bury them deep, with 80% or so of the plant in the dirt. The stem will turn into a nice root system.
... and bury them deep...
and crush a TUMS and throw it into the planting hole. The extra calcium prevents blossom end rot.
As for burying deep,,,I lay mine down on their side for the extra feeder roots.